ML20057G055

Provides Details & Schedules for on-going Initiatives Re Pressure Locking & Thermal Binding of Gate Valves at Util in Response to NRC Request Made During Meeting W/Licensee on 930913

ML20057G055
Person / Time
Site:	Fermi
Issue date:	10/13/1993
From:	Gipson D DETROIT EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CON-NRC-93-0127, CON-NRC-93-127 NUDOCS 9310200128
Download: ML20057G055 (3)

Text

ocuglas R. Gipson f,eneur Vu.c Presdent NJ<,! ear Generanon

. Detroit

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4 Oct obe r 13, 1993 NRC-93-0127 U. S. Nuclear Regulatory Commission Attn: Document Control Deck' Washington, D. C.

20555

References:

1) Fermi 2 NRC Docket No. 50-341 NRC License No. NPF-43

2) NRC Generic Letter 89-10 Phase II Inspection Report No. 50-341/93003, dated March 30, 1993

Subject:

Detroit Edison Initiatives on Pressure Locking and Thermal Binding of Gate Valves at Fermi 2 The purpose of this letter is to provide details and schedules for Detroit Edison's on going initiatives regarding pressure locking and thermal binding of gate valves at Fermi 2 in response to an NRC requect made during a meeting with Detroit Edison on September-13, 1993. This information is also related to an Unresolved Item on this subject discussed in Section 2.3.5 of the Phase II MOV Inspection Report (heference 2).

The initiatives discussed at the September 13, 1993 meeting and scheduled completion dates are as follows:

o INITIATIVE 1:

Resolve prescure locking issue on the 6 valves in Design Calculation 5132.

SCHEDULED COMPLETION: End of RF04 (May 1994) g{p

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- INITIATIVE 2:

.i Re-evaluate the potential for pressure locking and thermal binding of safety-related gate valves under the. scope of Generic j

Letter 89-10 at Fermi 2 using the existing analysis.,The review will include:

Review of the following existing documents:-

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- INFO SOER 84-7 GE SIL 368 1

- Information Notice 92-26 i

- GL 89-10, Supplement 6 (Proposed)

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- NUREG-1275, -Volume 9, March.7,1993 containing' AECD Report -

j S92-07.

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Confirm the assumptions in the evaluation methodology.

4 Confirm the scope of valves subject to pressure locking and

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o thermal binding.

SCHEDULED COMPLETION: October 1994 o

INITIATIVE 3:

"',s As part of the work scope _ in Initiative 2 above, utilize the EPRI Performance Prediction Program document.

This document is. scheduled to be -issued by EPRI in February of 1

1994. Effective use of this document is regarded to be important to a technically sound conclusion and a timely effort ias f

identified in Initiative 2.

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i SCHEDULED _ COMPLETION:

September 1994 o

INITIATIVE 4:

Procedures or work instructions will be-revised to assure the

_l proper consideration of pressure : locking and thermal ~ binding effects ~is given to the ' design and operation of af fectedivalves.

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SCHEDULED COMPLETION:. End of' RF05 (November 1995).

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= October 13.11993 NRC-93-0127 Page 3-o

' INITIATIVE 5:

Based upon the final evaluation of each valve ' set / group..

modifications will be initiated, as required.,

SCHEDULED COMPLETION: End of RF05 '(November 1995)-

Detroit Edison continues to participate in industry groups on this subject. Based on input from these industry groups and the reviews described above, changes needed in certain-details of our initiative 4 will be made, as appropriate.

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i If you have any questions, please contact Mr. Girija S. Shukla at (313) 586-4270.

Sincerely, pw V

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T. G. Colburn u

W. J. Kropp j

J. B. Martin M. P. Phillips li

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