ML19343B203

LER 80-037/03L-0:on 801117,during Review for Upgrading Environ Qualification of safety-related Electrical Equipment,It Was Determined That Namco Switches Were Not Hermetically Sealed.Caused by Installation Error

ML19343B203
Person / Time
Site:	Prairie Island
Issue date:	12/11/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19343B197	List: ML19343B196 ML19343B203
References
LER-80-037-03L, LER-80-37-3L, NUDOCS 8012150197
Download: ML19343B203 (2)

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'M <7 77 LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI CONTROL BLOCK: l l l l  ! I lh s

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EVENT OESCRIPTION AND PROB ABLE CONSEQUENCES h j

I O 121 l h4 ng review of our procram of uncradinc environmental qualification

o ;3; l of safety-related electrical equipment, a deficiency was noted with respect l lo,,;l to the status of NAMCO limit switches. Details are attached. Not repetitive. j N effect On public health and safety. l lo Isl l l

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l l1 IoIl Inadeauate installation inRemerinna. cn-ar fittines are necessary to I l lil3 1l hermetically seal the switches. This requirement was not known at the I i, ,,,j time the switches were installed. Conax fitting have been ordered and I

,;3; j will be installed where necessary on all NAMCO limit switches. l I

11 14 1l 80 7 8 3 ST S  % POWER OTHER STATUS OtS O RY DISCOVERY CESCRIPTION Vendor test report l I2 l 5 l l E l@ l ll 0 l 0l@l NA l lDl@l ACTIVITY CO TENT AELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE l1 168 9l W @ l10Zl@l NA l l NA l it 44 45 80 7

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$ 9 11 12 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION NA l 11 131lZl@l 7 8 ? 10 80 is L2m8 dSUE @lDENA CRIPTION l lllllllllllll{

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A. A. unstad 8012150 NAME OP PREPARER PHONE:

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4 80-037 Page 2 of 2 Northern States Power Compcny Prairie Island Nuclear Generating Plant LICENSEE EVENT REPORT SUPPLEMENT Lessons Learned Item 2.1.3.a Position Indication-Relief and Safety Valves Ref: 1) NSP Letter; L 0 Mayer to Director Nuclear Reactor Regulation, USNRC, December 14, 1979, " Lessons Learned Implementation"

2) NRC Latter; H Denton to L 0 Mayer, NSP, October 30, 1979,

" Discussion of Lessons Learned Short Term Requirements" During review of our program of upgrading environmental qualification of safety related electrical equipment, a deficiency was noted with respect to the status of NAMCO limit switches by the Prairie Island NRC Resident Inspector. The purpore of this letter is to describe the current sestus of these switches and our plans for resolving the deficiency that was found.

Our origina.' plans for upgrading the NAMCO switches were described in the response to Item 2.1.3.a of the short term lessons learned requirements. As noted in Reference (1):

For the pressurizer power operated relief valves, qualified limit switches are installed on Unit 1 for the closed indication. According to clarification 5 of Reference (2), the position indication should be environmentally qualified. Though this is a recommendation, not a requirement, we have orac ed environmentally qualified limit switches to assure both open and closed indication will be satisfactory. The NUREG-0578 discussion for Item 2.1.3.a points out that closed indication is of most concern. We expect to receive the limit switches in January and will install these prior to January 31, 1980 on Unit 2. A special outage would be required for Unit 1 for modification of the open limit switches and is not planned.

New qualified EA-180 limit switches were installed on both units by February 26, 1980. In late August, 1980, during investigations required by IE Bulletin 79-01B, we received the NAMCO test report on the qualification of EA-180 switches.

In reviewing this report we learned that additional installation requirements had l

to be met to assure environmental qualification applicability. As stated in our l response of October 31,1980 to 79-OlB, we have ordered material necessary to upgrade the EA-180 installation and will perform this work during planned outages after receipt. We had no prior information of the need for special installation in any documentation from NAHCO.

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