ML25196A426
| ML25196A426 | |
| Person / Time | |
|---|---|
| Issue date: | 09/14/1976 |
| From: | Moeller D Advisory Committee on Reactor Safeguards |
| To: | Rowden M NRC/Chairman |
| References | |
| Download: ML25196A426 (1) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION ADVISORY COMMITTEE ON REACTOR SAFEGUARDS WASHINGTON. D. C. 20555 September 14, 1976 Honorable Marcus A. Ro~en Chairman U.S. Nuclear Regulatory Corrnnission Washington, D.C.
20555
SUBJECT:
REPORI' ON WESTINGHOUSE ELECTRIC CORPORATION'S ECCS UPPER HEAD INJECTION EVALUATION MODEL
Dear Mr. Ro~en:
At its 197th meeting, September 9-11, 1976, the Advisory Committee on Reactor Safeguards completed a review of the Westinghouse Electric Corporation's ECCS Upper Head Injection (UHI} Evaluation Model.
Six Subcorrnnittee meetings have been held with representatives of the vJestinghouse Electric Corporation and the Nuclear Regulatory Corranission, the first being held at Monroeville, Pennsylvania, on June 25, 1975, and the remainin-3 meetings at Washington, OC, on October 4 and December 20, 1975, and March 16, June 15, and September 2, 1976. 'Ihe Corrnnittee also had the benefit of the doctnnents listed below.
- The NRC Staff has taken into account the special features of UHI and the supp:>rting research and developnent in order to formulate evaluation model requirements which suitably conform to 10 CFR 50, Appendix K.
- Further, sensitivity stu:lies are being performed by i~stinghouse to provide assur-ance that sufficiently conservative bounds for the evaluations will be included.
The ACRS believes that the Westinghouse Electric Corporation's ECCS UHI Evaluation Model, with the requirements set by the NRC Staff, will conform to 10 CFR 50, Appendix K.
'!he approved evaluation model, with appropriate use of plant-specific parameters on a case-by-case basis, will aid in the licensing reviews.
The ACRS encourages the NRC Staff to continue its deliberations in seeking accelerated and coordinated programs for establishing meaningful experi-mental facilities and independent analytical tools for studying the per-formance of UHI-ECC systems.
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Honorable Marcus September 14, 1976 As noted in its November 20, 1974 Report on Evaluation Models for Commission Criteria for Emergency Core Cooling Systems for Light-Water-Cooled Nuclear Power Reactors, the ACRS "remains mindful that the Evaluatior. Models, in themselves are not the desired end products, but that effective, reliable emergency core cooling systems are the objective." Continuing efforts are needed for implementing the safety research programs to provide bases for confirming design margins and for improving ECCS reliability and capability.
REFERENCES:
Sincerely yours, Dade w. Moeller Chairman
- l. "Status Report to the Advisory Committee on Reactor Safeguards in t.1-ie Matter of Westinghouse Electric Corporation ECCS-Upper Head Injection Evaluation Model Conformance to 10 CFR 50, Appendix K," *Proprietary (August 1976) U.S. Nuclear Regulatory Commission - Office of Nuclear Reactor Regulation.
- 2. \\CAP-8400 -
0 ECCS Heat Transfer Experiences with Upper Head Injection,"
Proprietary, Volume I (October 1974), Volume II (January 1975), Volume III (August 1976), \\~stinghouse Electric Corporation.
- 3. i'CAP--8479, Revision 1 - "Westinghouse Emergency Core Cooling System Evaluation Model Application to Plants Equipped with Upper Head Injec-tion," Proprietary (August 1976) Westinghouse Electric Corporation.
- 4. \\CAP-8582 - "BlO\\tiiown Experiments with Upper Head Injection in G-2, 17Xl7 Rod Array," Proprietary, Volume I (January 1976), Volume II (August 1976),
~stinghouse Electric Corporation.
- 5. \\CAP-8793 -
0G-2, 17Xl7 Refill Heat Transfer Tests and Analysis," Pro-prietary (August 1976) t-vestinghouse Electric Corporation.
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