ML25197A084
| ML25197A084 | |
| Person / Time | |
|---|---|
| Issue date: | 10/17/1975 |
| From: | Kerr W Advisory Committee on Reactor Safeguards |
| To: | Gossick L NRC/EDO |
| References | |
| Download: ML25197A084 (1) | |
Text
ADVISORY COMMITTEE ON REACTOR SAFEGUARDS NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Mr. lee V. Gossick Executive Director for Operations
- u. s. Nuclear Regulatory Corrmission Washington, D.C. 20555 October 17, 1975
Subject:
ALTERNATIVES 'IO STAFF POSITICN REX.;ARDING ANTICIPATED TRANSIEm'S WITHOUI' SCRAM (ATIVS)
Dear Mr. Gossick:
Q1 September 12, 1975, Mr. Ben C. Rusche, Director, Office of Nuclear Reactor Regulation, transmitted to the Advisory Committee on P,,eactor safeguards a working paper, dated September 12, 197:5, :md entitled "Discussion of Alternatives to the Previous Staff Fofdtion on Antici-pated Transients Without Scram for Construction Permit Applications Made After Cctober 1, 1976. 11
~e working paper primarily discusses various J;X)Ssible new regulatory approaches to "Class A" plants as categorized in WASH-1270, "Antici-pated Transients Without Scram for Water-Cooled Fower Reactors,"
dated September, 1973. 'Ihe Class A category of WASH-1270 requires design changes that \\\\'Ould improve significantly the reliability of the shutdown system. 'Ihis category was to apply to those applica-tions docketed subsequent to Cctober 1, 1976.
'Ihe Class B category of WASH-1270 applies to reactors docketed from early 1968 to Cctober 1, 1976, and requires that the consequences of a postulated A'Il'lS must be acceptable and that those J;X)rtions of the reactor shutdown system which might be particularly vulnerable to comrron mode failures be identified and corrected.
Subsequent to the publication of WASH-1270, the NRC Staff has con-tinued to review the several vendor proposals for reet~ Class A and Class B requirements. 'Ihe NRC Staff has advised the Corrmittee that it now believes it \\\\'OUld be appropriate that Class 1. plants be treated in the same manner as Class B plants.
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lee v. G:>ssick October 17, 1975
~e ACRS has reviewed the working paper and discussed the matter with the NRC Staff during the Corr~ttee's 186th Meeting, October 9-11, 1975. ~e COrrmi.ttee concurs with the NRC recornrrendation.
REFERENCES:
Sincerely yours, w-13/4~
W. Kerr Olaianan
- 1. U.S. Atomic Energy Commission Regulatory Staff'<! Technical Report on Anticipated Transients Without Scram For Water*.. -.:_:ooled Power Reactors, WASH-1270, dated September, 1973.
- 2.
U.S. Nuclear Regulatory Commission Staff's i;~rking Paper: Dis-cussion of Alternatives To The Previous Staff Position on Antici-pated Transients Without Scram for Construction Permit Applications Made After October I, 1976, dated September 12, 1975.
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