ML20207L611

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Documents Understanding of Basis for Resolution of Issues Re Ability of Cable Splices Inside Foxboro Instrument Terminal Box to Withstand Moisture Intrusion & Loose Conduit Found on Valve FMO-231,per Telcon
ML20207L611
Person / Time
Site: Cook  American Electric Power icon.png
Issue date: 01/06/1987
From: Alexich M
INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
AEP:NRC:0775AI, AEP:NRC:775AI, NUDOCS 8701120257
Download: ML20207L611 (7)
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INDIANA & MICHIGAN ELECTRIC COMPANY P.O. BOX 16631 COLUMBUS, OHIO 43216 January 6, 1987 AEP:NRC:0775AI Donald C. Cook Nuclear Plant Unit Nos. 1 and 2 Docket Nos. 50-315 and 50-316 License Nos. DPR-58 and DPR-74 ENVIRONMENTAL QUALIFICATION AUDIT -

RESOLUTION OF OPEN ITEMS Mr. James G. Keppler, Regional Director U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Mr. Keppler:

During conversations with your staff regarding the recent audit of the D. C. Cook Plant's Environmental Qualification Files, two issues were identified as potential enforcement items. The first concerned the ability of cable splices inside the Foxboro Instrument Terminal Box to withstand moisture intrusion, and the second concerned a loose conduit found on valve FMO-231 in Unit 1.

It is our understanding, based on the telephone conversations, that the Foxboro Instrument Terminal Box issue has been resolved and is considered to be closed. Our understanding of the basis for the resolution and appropriate photographs are provided in the attachment to this letter.

The loose conduit on valve FM0-231 has been evaluated.

During our investigation of the condition, we found that the conduit was in place.

However, it was not secured properly near the limit switch compartment due to a damaged connector. Valve FMO-231 is in the discharge line of the turbine-driven auxiliary feedwater pump.

Following a steam line break it moves to an intermediate position to limit flow to its associated steam generator.

It is also used as a shutoff valve should flow to its associated steam generator need to be stopped. The connector is a standard non-sealed clamp type which had damaged locknut threads. As a result, the conduit, although inserted, was not secured.

Neither the valve actuator nor the conduit are sealed.

The valve actuator itself was qualified under test conditions which could have allowed some moisture intrusion to occur.

(No attempt was made to seal the limit switch compartments.)

8701120257 870106 PDR ADOCK 05000315 O/

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Mr.1Jemas G. Kappler. AEP:NRC:0775AI The valve actuator is _ located in the vestibule area, which' is adjacent to the. main steam accessway. This area contains a four-inch line which provides steam to'the' turbine-driven auxiliary feed pump.

Since a rupture

.of the-four-inch line would incapacitate the turbine-driven pump, valve FMO-231 is not needed to regulate auxiliary feedwater flow for this accident. Thus, the adverse environment to which this valve would be' subjected would result _from moisture' entering the vestibule area from adjacent compartments. Because of this, the. valve actuator, which would not be exposed to direct spray impingement, should only be subjected to an

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insignificant amount of moisture intrusion due to condensation effects following such an' event.

This document has been-prepared following Corporate procedures which incorporate a reasonable set of controls to insure its accuracy and completeness prior to signature by_the undersigned.

Very truly yours, o

b exichjhh M.

Vice Presidene g7 If cm cc: John E. Dolan W. C. Smith, Jr. - Bridgman R. C. Callen G. Bruchmann G.'Charnoff NRC Resident. Inspector - Bridgman i

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ATTAC10!ENT TO AEP:NRC:0775AI EVALUATION OF FOXBORO INSTRUMENT t

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Attactment to AEPsNRC:0775AI ca ete g gem e

4 AMERICAN ELECTRIC POWER SERvlCE kdkRATION AEP O WEm sv5TE CATE' October 10, 1980 "2 JECT' D. C. Cook Units 1 & 2 Environmental Qualification Foxboro Instrument Terminal Box FROM:

K. J. Munson - EGS TC' J. G.

Feinstein - NS&L Per your request, af ter our discussions with the NRC on 10/9/86, attached are copies of enlarged photos of typical Foxboro pigtail splice configurations inside the instrument's terminal box and a polaroid photo of a terminal box arrangement.

Please note that the bulk of the Raychem product splice is suspended in air inside the box by the field cable and/or instrument pigtails.

It is possible for the Raychem splice to be touching the sides or bottom of the box.

However, the majority of the splice can be seen away from the walls.

This conditicn is predicated by a relatively long and usually bent Raychem splice placed inside a relatively small terminal box.

These comments on the instrument splice configuration are based on photographs obtained during a recent walkdown of a small cample of Foxboro instrument pigtail splices.

To the best of our knowledge, these photos represent typical configurations through past discussions with plant personnel who recently installed the instrument splices.

We do not know of any other installed configuration that would represent a significantly worse condition of moisture collection and splice submergence than represented in these photos.

We understand that these pictures showing a typical suspended splice configuration will verify our statements made to the NRC per pnone conversation on 10/9/86.

As stated by the NRC representative at that time, this potential enforcement /

unresolved item would then be closed-out.

If you have any question or comments, please let us know.

W

-l K. J. Munson KJM/ris/61.23 Approved ht/(

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