ML20205P906

Forwards Safety Insp Rept 50-293/86-17 on 860412-0425.No Violation Noted.Rept Identifies Several Areas for Improvement That Warrant Util Consideration

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: IR 05000293/1986017 ML20205P906 ML20205P914
References
CAL-86-10, NUDOCS 8605280044
Download: ML20205P906 (3)

See also: IR 05000293/1986017

Text

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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 BI*.

PDR ADOCK 05000293

G PDR 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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Boston Edison Company M/C Nuclear 2

cc w/ encl:

-L. Oxsen, Vice President, Nuclear Operations

'C. J. Mathis, Station Manager

W oanne Shotwell, Assistant Attorney General

Maul Levy, Chairman, Department of Public Utilities

- -Plymouth Board of Selectmen

- Plymouth' Civil Defense Director

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- Senator Edward P. Kirby

Public Document Room (PDR)

Local Public Document Room (LPDR)

Nuclear Safety Information Center (NSIC)

- NRC Resident Inspector

vCommonwealth of Massachusetts (2)

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+ Region I Docket Room (with concurrences)

" Management Assistant, DRMA (w/o encis)

+ S. Ebneter

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- AIT Members

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J . Taylor, OE

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Plymouth Board of Selectmen

Plymouth Civil Defense Director

Senator Edward P. Kirby

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Nuclear Safety Information Center (NSIC)

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Commonwealth of Massachusetts (2)

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