ML20247B424

Part 21 Rept Re Failure of Solenoid Operated Air Pilot Valves for Main Steam Sys Safety/Relief Valves to Meet Environ Qualification Requirements.Following Rev of Vendor Manual,Util Will Install Raychem Heat Shrink Sleeves

ML20247B424
Person / Time
Site:	Clinton
Issue date:	05/04/1989
From:	Hall D ILLINOIS POWER CO.
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-89, REF-PT21-89-078-000 DPH-0274-89, DPH-274-89, PT21-89-078-000, PT21-89-78, U-601443, NUDOCS 8905240120
Download: ML20247B424 (3)

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L16-89 ( 05-04 )-LP 1A.120

/LLINDIS POWER COMPANY CLINTON POWER STATION P.O. BOX 678 CLINTON ILLINOl$ 61727

.i DPH-0274-89 l May i, 1989 j 10CFR21.21 1 1

I Docket No. 50-461-Mr. A. B. Davis Regional Administrator ]

Region III U.S. Nuclear Regulatory Commission ,

799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

10CFR21 Defect 21-89-02:

Failure of Solenoid Operated Air Pilot Valves for the Main Steam System Safety / Relief Valves to Meet Environmental Qualification Requirements

Dear Mr. Davis:

On May 2, 1989, Illinois Power Company (IP) identified a potential 10CFR21 defect concerning the Environmental-Qualification services NUTECH provided for the solenoid operated air pilot valves of the main steam system safety / relief valves at Clinton-Power Station. The power supply connection to the solenoids of the air pilot valves was qualified with a Raychem heat shrink sleeve over the-connector, however the installed configuration did not 7 include the Raychem heat shrink sleeve because NUTECH failed to'specify that a Raychem heat shrink sleeve was a design requirement needed to meet Environmental Qualification.

Based on an evaluation of this matter, IP is providing the following information to the Commission in accordance with the requirements of 10CFR, Part 21.21(b) (3) .

(i) D. P. Hall, Vice President of Illinois Power Company, is informing the Commission of a 10CFR21 defect by means of this report.

(ii) The basic component involved in this reportable defect is the Environmental Qualification service l

provided by NUTECH to qualify the Eugen Seitz solenoid operated air pilot valves of the main steam j

safety / relief valves.

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. . . U-601443 L16-89 (05 -04 )-LP 1A.120 (iii) The Environmental Qualification services for qualification of the solenoid operated air pilot valves was provided by NUTECH.

(iv) The defect relates to the Cannon plug connectors which connect the power supply to the solenoids of the air pilot valves. NUTECH performed the Environmental Qualification of the solenoid operated air pilot valves with a Raychem heat shrink sleeve over the Cannon plug connectore; however, NUTECH failed to identify that the Raychem heat shrink sleeve was a design requirement needed to meet Environmental Qualification. Because NUTECH failed to identify this design requirement, the Raychem heat shrink sleeve was not installed at Clinton Power Station and therefore, the solenoid operated air 1 pilot valves did not meet Environmental Qualification requirements.

IP has reviewed and evaluated the findings associated with this defect and has concluded that if this defect had gone uncorrected, it could have resulted in a loss of capability for manual or automatic depressurization of the reactor pressure vessel (RPV). This depressurization capability is needed to reduce RPV pressure to within the capability of the low pressure core spray and low pressure core injection systems in the event of a concurrent small line break and a high pressure core spray system failure. Over-pressurization of the RPV would not

. have occurred because the safety (spring activated) mode of operation of the safety / relief valves was not affected by this defect.

(v) IP discovered that the solenoid operated air pilot valves did not meet Environmental Qualification requirements on April 28, 1989 during review of Equipment Qualification package EQCLO65.

(vi) IP has determined that the defect is limited to the Cannon plug connector of each of two solenoid

operated air pilot valves on each of the sixteen main l steam safety / relief valves, for a total of thirty-two connectors. NUTECH has not provided any other l

Environmental Qualification scrvices for the Clinton Power Station.

(vii) IP will revise the vendor manual for the Eugen Seitz solenoid operated air pilot valves to require the installation of Raychem heat shrink sleeves over the Cannon plug connectors which connect the power supply to the solenoids of the air pilot valves. The vendor l manual revision will also add installation l instructions for the Raychem heat shrink sleeves.

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, , . U-601443 Ll6-89 ( 0514 )-LP 1A.120 This revision is scheduled to be completed by May 4, 1989.

Following revision of the vendor manual, IP will install Raychem heat shrink sleeves on all thirty-two of the Cannon plug connectors of the solenoid operated air pilot valves for the main steam safety / relief valves. These installations are scheduled to be completed by May 7, 1989.

(viii) The Environmental Qualification of the Eugen Seitz solenoid operated air pilot valves was performed jointly for the Clinton Power Station, the Perry Nuclear Power Plant, and the Grand Gulf Nuclear Station by NUTECH. Therefore, by copy of this letter, IP is providing notification of this defect to the licensees associated with these power plants.

IP's evaluation of this reportable defect is available for your review at our offices. I trust this letter provides sufficient information for your review and assessment of this reportable defect.

Sincerely yours,

. . Hall Vice President RSF/krm cc: NRC Resident Office Director, Office of Nuclear Reactor Regulation (3 copies)

INPO Records Center Illinois Department of Nuclear Safety Vice President Nuclear, Cleveland Electric Illuminating Company Vice President, System Energy Resources, Incorporated l

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