ML20203C649
| ML20203C649 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 04/12/1986 |
| From: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Harrington W BOSTON EDISON CO. |
| References | |
| CON-#487-5031 2.206, CAL-86-10, NUDOCS 8604210211 | |
| Download: ML20203C649 (2) | |
Text
f g
April 12, 1986
(
CAL No.:
86-10 Docket Number:
50-293 Boston Edison Company M/C Nuclear l
ATTN: Mr. William D. Harrington Senior Vice President, Nuclear 800 Boylston Street Boston, Massachusetts 02199 Gentlemen:
Subject:
Confirmation of Actions to be Taken with Regard to the Pilgrim plant Events Which Occurred on April 11-12, 1986 Pursuant to our telephone conversation on April 12,1 Li with Mr. Oxsen it is our understanding that you have taken or will take the following actions:
1.
Maintain all affected equipment related to the events which occurred on April 11-12, 1986 in its as-found condition (except as necessary to maintain the plant in a safe shutdown condition) in order to preserve any evidence which would be needed to inspect or reconstruct the events.
2.
Develop troubleshooting plans and procedures and provide those to the NRC Augmented Inspection Team (AIT) for their review and comment prior to initiating any troubleshooting of the affected equipment, f
3.
Advise the AIT leader prior to the conduct of any troubleshooting l
activities.
4.
Make available to the NRC AIT relevant written material related to previous problems with the affected equipment, f
5.
Provide a written report to the Regional Administrator prior to restart that contains your evaluation of the following:
a.
Intersystem leakage through the motor-operated injection valves (including the check valve) of the residual heat removal system; b.
The primary containment isolation which occurred during shutdown after the reactor mode switch was repositioned l
from the run mode to the startup mode; l
e60421oa11 e60412 g3 0FFICIAL RECORD COPY ADOCK O gDR l
l 0 t
.~
f l-l The failure of the outboard main steam isolation valves to c.
reopen after resetting the primary containsnent isolation signal.
l Thisreportshouldincludetheunderlyingcauseshortheabove noted events, an assessment of their relationship to previous events including the events of April 4, 1986, corrective actions taken and your basis for restart, including the criteria used and your analyses ah,ociated with these criteria.
Further we understand that restart will not occur until you receive authoriza-tion from the Regional Administrator.
If your understanding of the actions to be taken are different than those described above, please contact this office within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the receipt of this letter.
Thank you for your cooperation.
l l
Sincerely, J
l JLS Thomas E. Murley Regional Administrator cc:
L. Oxsen, Vice President, Nuclear Operations
[
C J. Mathis, Station Manager Joanne Shotwell, Assistant Attorney General Paul Levy, Chairman, Department of Public Utilities Plymouth Board of Selectmen Plymouth Civil Defense Director Senator Edward P. Kirby Public Document Room (PDR) f Local Public Document Room (LPDR)
Nuclear Safety Information Center (MSIC)
NRC Resident inspector Commonwealth of Massachusetts (2)
V. Stello, EDO J. Taylor, IE J. Sniezek, EDO J. Zwolinski,f;RR P. Leech, NRR Cy W
KKister/mrf vpfie
/((Murley 4/12/86 4/12/86 4/12/86 0FFICIAL RECORD COPY l
.