ML20205P906
| ML20205P906 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 05/16/1986 |
| From: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Harrington W BOSTON EDISON CO. |
| Shared Package | |
| ML20205P911 | List: |
| References | |
| CAL-86-10, NUDOCS 8605280044 | |
| Download: ML20205P906 (3) | |
See also: IR 05000293/1986017
Text
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4
4-
MAY 161986
Docket No. 50-293
Boston Edison Company M/C Nuclear
ATTN: Mr. William D. Harrington
Senior Vice President, Nuclear
800 Boylston Street
Boston, Massachusetts 02199
Gentlemen:
Subject:
Inspection Report No. 50-293/86-17
During the period April 12 through April 25, 1986, an Augmented Inspection Team
(AIT) conducted a special safety inspection of recent operational events at the
,
Pilgrim Nuclear Power Plant. These events included 1) the spurious group-one
primary containment isolations (and associated reactor scrams) that occurred on
April 4 and 12,1986, 2) the failure of the main steam line isolation valves to
promptly reopen after the containment isolations, and 3) recurring pressuriza-
tions of the residual heat removal system.
The inspection results are docu-
mented in the enclosed report and were summarized at the conclusion of the in-
spection.in a meeting with your staff. This report identifies several areas
for improvement that warrant your consideration.
Although your evaluations following the April 12, 1986 containment isolation
(and scram) were carefully structured and appeared thorough, the underlying
reasons for some of the problem are not yet fully understood.
In particular,
the reasons for the spurious containment isolations have not been determined.
Similarly, although we understand the technical reason for failure of the Main
Steam Isolation Valves (MSIV) to reopen after closure, we need to better under-
stand the design review and implementation process associated with the modifi-
cation in 1983 that resulted in the MSIV problem.
In accordance with Confirma-
tory Action Letter No. 86-10, we await submittal of your report documenting the
results of the efforts taken to identify the root cause of the subject events
and proposed corrective actions. After receipt of your report, we will review
it and schedule a meeting, if necessary, to discuss any questions or concerns
that we may have.
Your cooperation with us is appreciated.
Sincerely,
_
.
8605280044 860516
Original Signed B *.
I
ADOCK 05000293
G
Richard Starostecki, Director
.
Division of Reactor Projects
Enclosures:
Augmented Incident Response Team Report
0FFICIAL RECORD COPY
PILGRIM AIT 86-17 - 0001.0.0
05/15/86
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Maul Levy, Chairman, Department of Public Utilities
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