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[Program Service | Recent programs]

CSNI0003 LOBI/B-R1M. (Abstract last modified 12-OCT-1988)


LOBI/B-R1M, Loop for Blowdown Investigation, PWR Single-Ended Cold-Leg Break Experiment B EXP.B

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Abstract Table of Contents:

NAME | COMPUTER | PROBLEM | SOLUTION | RESTRICTIONS | CPU | FEATURES | AUXILIARIES | STATUS | REFERENCES | REQUIREMENTS | LANGUAGE | OPERATING SYSTEM | OTHER RESTRICTIONS | AUTHOR | MATERIAL | CATEGORIES |

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1. NAME OR DESIGNATION - LOBI/B-R1M.


2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name         Package-ID  Status
LOBI/B-R1M           CSNI0003/01 Arrived

Machines used:
Package-ID     Orig.Computer                       Test Computer
CSNI0003/01    Many Computers                      

3. DESCRIPTION OF TEST FACILITY - The LOBI facility is a 1/700 scale model of a four loop PWR and has two primary loops, the intact loop representing three loops and the broken loop representing one loop of a four-loop PWR. The reactor pressure vessel model contains an electrically heated rod-bundle with 64 rods and a heated length of 3.9 m. The nominal heating power is 5.3 MW. The downcomer is of annular shape. An upper head simulator is connected to the vessel. Each of the two primary loops contains a pump and a steam generator. The different mass flows in the loops are established by the pump speeds, since the two pumps are identical. Heat is removed from the steam generators by a secondary system. ECC water can be supplied from two accumulators, one for each loop. Cold or hot leg as well as combined injection can be simulated.
The LOBI test facility is the only high pressure integral test facility within the European Communities (1982), built and operated in the Joint Research Centre, Ispra, ITALY. In the LOBI experiments the thermal-hydraulic behavior of the facility during a transient, caused by a simulated loss of coolant accident (LOCA), is investigated to provide an experimental basis for analytical model development and code verification.


4. DESCRIPTION OF TEST - The test B-R1M is one of the LOBI experimental program B which was performed in the LOBI test facility. This test belongs to the interim test program which comprises a total of five large cold leg break tests.
In the B-R1M a single ended cold leg break between the primary pump and the pressure vessel, with ECC water injection into the intact cold loop leg only, was simulated. The double ended rupture device was used. The flap on the pump side remained closed and the flap on the vessel side was opened. The isolation valve between the two flaps was maintained in the open position. In this test the pressurizer was connected to the intact loop.
Test B-R1M represents the smallest large-break test of a series of four which were envisaged to cover the large break spectrum and thus substantiate the influence of break size on blowdown in the case of cold leg break and with intact loop cold leg ECC water injection only. In these tests the downcomer gap width was 50 mm.


5. EXPERIMENTAL LIMITATIONS OR SHORTCOMINGS - LOBI experiments cover only the blowdown phase of a transient. The available downcomer gaps result in either unrealistic core flows or too large a hot-wall effect and unrealistic ECC delivery.


6. PHENOMENA TESTED - Phase separation, 1- and 2-phase pump behavior.


7. SPECIAL FEATURES OF EXPERIMENT - LOBI's large size and full height components are considered an advantage.


8. COUNTERPART EXPERIMENTS - Semiscale.


9. STATUS
CSNI0003/01: 12-OCT-1988 Arrived at NEADB


10. REFERENCES  - 
CSNI0003/01:
- C. Addabbo:
LOBI and Semiscale Counterpart Tests, Preliminary Comparison Analysis of LOBI-
MOD1 Test B-R1M and SEMISCALE MOD2A Test S-1B-3
ISPRA Technical Note No. I.06.01.83.17, January 1983
- E. Ohlmer, J. Sanders:
Experimental Data Report on LOBI Test B-R1M
ISPRA LEC 82-08, Communication No. 3816, April 1982
- C. Addabbo, G. De Santi, L. Piplies:
Quick Look Report on LOBI Test B-R1M
ISPRA LQC 82-08, Communication No. 3815, March 1982
- W. Kolar and W. Brewka:
LOBI Experimental Data Tape - Format Description -
Technical Note No.I.06.C1.85.49 (May 1985)
- LOBI Project - RELAP5 Base Input Data for LOBI-MOD2
LPC 85-18 (February 1985)


11. TEST DESIGNATION - B-R1M


12. PROGRAMMING LANGUAGE(S) USED -
CSNI0003/01: 


15. ESTABLISHMENT - 
        Commission of the European Communities 
        Joint Research Centre 
        Ispra Establishment 
        I-21020 Ispra 
        ITALY


16. MATERIAL AVAILABLE -
CSNI0003/01:
LOBI-MOD1 B-R1M data     4.0 MB            


17. CATEGORIES  - 

- Y. Integral Experiments Data, Databases, Benchmarks


Keywords: BLOWDOWN, DATA, LOSS-OF-COOLANT ACCIDENT, TRANSIENTS

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