ML19329B641
| ML19329B641 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 01/17/1977 |
| From: | Goller K Office of Nuclear Reactor Regulation |
| To: | Sniezek J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| NUDOCS 8002050756 | |
| Download: ML19329B641 (2) | |
Text
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n JAN 171977 sc-346 MEMORANDUM FOR: James H. Sniezek, Chief Light Water Reactor Programs Branch, ISE FR0!1:
Karl.R. Goller, Assistant Director for Operating Reactors, 00R
SUBJECT:
DAVIS-BESSE, UNIT 1 - PRESSURIZER AND STEAM LINE SAFETY VALVES Your December 9th memo brought to our attention an apparent problem in setting the lifting pressure for pressurizer and steam line safety valves to meet the proposed Davis-Besse, Unit 1 Technical Specifications 3.4.2,.3.4.3 and 3.7.1.1.
This apparent problem stems from the fact that the safety valve lifting pressure is temperature dependent and within the range of expected ambient temperatures the lifting pressure of the safety valves may exceed the setpoint specified in the proposed Technical Specifications.
The setpoint of the safety valve is established for nominal operating tamperature and pressure conditions, including ambient conditions at the valve. This setpoint may be sec and tested at various ambient te.:peratures, with various fluids, and by various methods, provided the lifting pressure is correlated to the specified setpoint at nominal operating conditions.
A decrease in the ambient temperature conditions at the valve with changing modes will effect the lifting pressure of the valve. The lifting pressure may slightly exceed the technical specification set-point tolerance limits of +l%.
Since the setpoint for nominal operating conditions has not changed, the drift of the lifting pressure of the safety valve outside of the +1% tolerance limits is acceptable. The drift of lifting pressure outside the tolerance limits with changing ambient conditions does not constitute non-compliance with the intent of the limiting condition for operation and therefore does not constitute an unreviewed safety question.
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James H. Sniezek JAN I 71977 This apparent problem is generic to the Standard Technical Specifications.
The Standard Technical Specifications and the Davis-Besse Specifications will be modified to clarify the original intent of these specifications.
This modification will be the addition of the following footnote to Technical Specifications 3.4.2, 3.4.3 and 3.7.1.1:
"The lift setting pressure shall correspond to ambient conditions of the valve at nominal operating temperature and pressure.
Should you have further questions on this matter, please centact J. Roe of my staff.
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Karl R. Galler, Assistant Director for Operating Reactors Division of Operating Reactors cc:
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