ML16341E333
| ML16341E333 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 06/04/1987 |
| From: | Richardson J Office of Nuclear Reactor Regulation |
| To: | Trammell C Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML16341E332 | List: |
| References | |
| TAC-63470, NUDOCS 8707160204 | |
| Download: ML16341E333 (2) | |
Text
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UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 dUN 0~ ~y MEMORANDUM FOR:
FROM:
SUBJECT:
Charles M. Trammell, Project Manager Project Directorate V
Division of Reactor Projects III, IV, V and Special Projects James E. Richardson, Assistant Director for Engineering Division of Engineering and Systems Technology MAIN STEAM LINE CHECK VALVE OPERABILITY OF DIABLO CANYON UNITS 1 AND 2 (TAC 863470)
During the performance of inservice testing of main steam isolation valves (MSIVj for Unit 81, the licensee had observed problems with retaining nuts on discs for the MSIVS.
At the time of this observation Unit 1 was in refueling outage and Unit 2 was in power operation.
The licensee had committed to take certain actions to assure itself that similar problems did not exist in the Unit 2 MSIVs and that it was safe to continue to operate the Unit 2 reactor.
The licensee provided additional information in two letters.
Staff of the Engineering
- Branch, PWR-A, was requested to review the information submitted by the licensee and provide a safety evaluation.
The attached evaluation was performed in response to TAC 63470 and this action completes our commitment for this activity. It is concluded in this evaluation that the licensee fulfilled its commitments to assure safe operation of Unit 2.
Attachment:
As stated cc:
L. C.
Shao G.
M. Holahan
'6."'Knighton T. Marsh G. Bagchi es E. Richardson, Assistant Director for Engineering Division of Engineering and Systems Technology Bi07fb020'I 5000275 870708
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