ML20127N695

Elaborates on Util Commitments to Listed Plant Activities, Including CRD Mechanism Temp Recording,Requalification, Surveillance & Preventative Maint,Backup Reactor Shutdown Procedure,Tendons & Pcrv Integrity & Electrical Sys

ML20127N695
Person / Time
Site:	Fort Saint Vrain
Issue date:	06/14/1985
From:	Brey H PUBLIC SERVICE CO. OF COLORADO
To:	Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
P-85199, TAC-51955, TAC-54639, TAC-55294, NUDOCS 8507020085
Download: ML20127N695 (7)

Text

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PublicService reuo s..

Company of Colorado June 14, 1985 Fort St. Vrain Unit No. 1 P-85199 Regional Administrator lW@]Q@ %

Region IV y

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U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000

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R N I B 155 Arlington, Texas 76011

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Attention: Mr. Eric H. Johnson

_J Docket No. 50-267

SUBJECT:

Additional Comitment Information

REFERENCES:

(1) NRC Letter, Denton to Walker, dated 10-16-84 (G-84392)

(2) PSC Letter, Lee to Johnson, dated 1-4-85 (P-85003)

(3) NRC Letter, Martin to Lee, 8507020085 850614 dated 1-17-85 (G-85024)

PDR ADOCK 05000267 F

PDR (4) PSC Letter, Lee to Johnson dated 1-28-85 (P-85030)

Dear Mr. Johnson:

References (1) through (4) identify the NRC Assessment Report findings and the various PSC activities and comitments that must be completed in response to the Assessment Report.

Based on recent contacts with the NRC staff, PSC's comitments related to several Fort St. Vrain plant acti"ities require elaboration.

Attachment 1 to this letter consolidates PSC's comitments related to the following areas:

A.

CRDM Temperature Recording and Requalification,

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(W1 B.

CRDM Surveillance and Preventive Maintenance, f

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Backup Reactor Shutdown Procedure, g

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Tendons and PCRV Integrity, t

7 E.

Electrical Systems, and

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Long Ter.n Issues.

If you have any questions concerning these issues, please contact Mr. M. H. Holmes at (303) 571-8409.

Very truly yours, H. L. Brey, Manager Nuclear Licensing and l

Fuels Division i

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HLB /MRS/sem l

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Page 1 of 4 ADDITIONAL COMMITMENT INFORMATION Note: References for this attachment are listed on page 4.

A.

CRDM Temperature Recording and Requalification Per the interim Fort St. Vrain Technical Specifications for control rods, (reference 1), CRDM motor temperatures will be monitored to insure CRDM motor temperatures are less than 250 degrees Fahrenheit.

In the event CRDM motor temperatures exceed l

215 degrees Fahrenheit, the temperatures will be recorded.

PSC has installed a multipoint recording device which provides frequent monitoring (at least one reading per minute) for each CRDM assembly motor temperature. Presently, PSC has a program underway to requalify CRDM motors for operating temperatures to 300 degrees Fahrenheit, (reference 2).

B.

CRDM Surveillance and Preventive Maintenance l

Current CRDM Surveillance and Preventive Maintenance Programs at l

Fort St. Vrain are described in reference 3.

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Detailed CRDM curveillances and preventive maintenance l

requirements have been included in the interim Fort St.

Vrain l

Technical Specifications for control rods, (reference 1).

These I

surveillance actions will provide assurance that necessary Rod Position Indicators are operable and accurate.

In addition, PSC is determining the feasibility of developing enhanced surveillance tests and preventive maintenance practices.

This development effort will review CRDM surveillances and maintenance / overhaul experiences and results, and determine whether surveillance activities, schedules, or acceptance criteria can be improved.

PSC's plans for developing enhanced surveillance tests and preventive maintenance practices will be submitted for NRC review within 6 months of plant restart.

Page 2 of 4 C.

Backup Reactor Shutdown Procedure The requirements outlined in reference 1 will be incorporated into appropriate plant operating procedures including the necessary steps to be taken for reserve shutdown system (RSD) actuation. These procedures will require insertion of sufficient RSD material to achieve the required Shutdown Margin within one hour after determination that adequate Shutdown Margin does not

exist, if the situation cannot be otherwise rectified within the one hour period.

D.

Tendons and PCRV Integrity The current interim Fort St. Vrain revised Tendon Surveillance Program is outlined in reference 4.

This program changes the previously proposed 18 month frequency for visual inspection to a six month frequency. The proposed program also establishes a control group of tendons to permit a aetter assessment of corrosion rate.

Additional inspections consist of examining the tendon end caps, prestressing anchor assembly stressing washer, shims, bearing

plate, and buttonheads for evidence of general corrosion, concavity, water or other apparent failures.

Recent examination results are described in references 5 and 6.

Liftoff tests measuring the amount of load in the tendons are also being performed as described in reference 7.

PSC will provide the NRC with the results of the interim surveillance program every six months after plant restart.

Additionally, as part of the Technical Specification Upgrade Program, the requirements of the interim Tendon Surveillance Program will be incorporated into the Technical Specifications.

E.

Electrical Systems Reference 8 contains PSC responses to NRC concerns from the recent electrical system review including 1) 4kV Rapid Transfer System, 2)

Independence of Redundant Trains, 3) Testing of the 4kV Rapid Transfer System and 4) Switchgear Powering.

Page 3 of 4 F.

Long Term Issues Reference 9 contains PSC responses to the long term issues identified in the NRC Assessment Report of October 16, 1984.

Some of these issues have been completed, (e.g., CRD motor temperatures and Watt meter testing). The remaining issues are in progress and PSC will submit a schedule for their completion within two months of restart.

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Page 4 of 4 a.

REFERENCES FOR ATTACHMENT 1 1.

PSC Letter, Lee to Johnson, dated 6-7-85 (P-85180) 2.

PSC Letter, Lee to Johnson, dated 1-30-85 (P-85032) 3.

PSC Letter, Lee to Johnson, dated 1-31-85 (P-85040) 4.

PSC Letter, Warembourg to Johnson, dated 3-5-85 (P-85071) 5.

PSC Letter, Warembourg to Johnson, dated 5-20-85 (P-85176) 6.

PSC Letter, Warembourg to Johnson, dated 6-7-85 (P-85193)

7. _PSC Letter, Warembourg to Johnson, dated 3-18-85 (P-85084) 8.

PSC Letter, Warembourg to Johnson, dated 6-14-85 (P-85208) 9.

PSC Letter, Lee to Johnson, dated 1-4-85 (P-85003) l

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