ML20011E959
| ML20011E959 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 01/08/1990 |
| From: | Taylor J NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Murley T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20011D095 | List: |
| References | |
| NUDOCS 9002230198 | |
| Download: ML20011E959 (2) | |
Text
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. UNITED STATES NUCLEAR REGULATORY COMMISSION j
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JAN 0 81990 y
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L MEMORANDUM FOR: Thomas E. Murley, Director Office of Nuclear Reactor Regulation l
FROM:
James M. Taylor Executive Director for Operations
SUBJECT:
'0PERATIONAL USAGE OF LARGE PURGE SYSTEM VALVES - PWRS; REEXAMINATION OF NRR'S SAFETY POLICY AND PRACTICES J
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.The October 19, 1989 Differing Professional Opinion (DPO) by Mr. R. Licciardo l
to me contarning the operational usage of the Zicn large (42" dia.) purge l
system valves requested an independent, outside review of the DPO. This inde-pendent review has now been completed. The findings from this review were 1'
substantially supportive of your basic technical and safety findings on the Zion matter regarding the overall public risk and the health and safety conse-quences. However, a common issue emerged from your review of the d'ffering professional view by Mr. Licciardo and from the independent review given to L
his DPO. This issue is best captured by the view I received from the indepen-p dent DP0 review:
"There seems to be some confusion as to the regulatory requirements for allowable times and conditions for operation of these large valves.
(We noted that this issue may be moot; Zion does.not ac-tually envision routine operation with valves open, we were informed).
Perhaps the need to routinely purge reflects some basic design de-ficiency which should be addressed.- In any case, it is clear that the containment leak tight criterion is better served if one does not have to open large butterfly valves from time to time, or leave them open indefinitely.
In our opinion, NRR should reexamine policy in.
this area."
Accordingly, I request that NRR undertake a reexamination of the above design
> question and policy issue.
I'd like to more completely understand the safety rationale for those existing PWR practices that depart from opening of the 1
large purge system valves except on an as-needed, time-restricted basis. Please advise me of your plans for completing this reexamination and the ;chedule on
.uhich I might have your findings.
/
a ecutive Di ctor for Operations cc:
J. Sniezek 3
E. Beckjord D. Ross J. Murphy L. Soffer l
R. Licciardo M k
9002230198 900131
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PDR ADOCK 05000295 PNV us p
NRC Form 8-C (4 79),
y-NRCM 0240 COVER SHEET FOR CORRESPONDENCE Use this Cover Sheet to Protect Originals of Multi-Page Correspondence.
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