ML20154K887

Requests Results of Review of Potential Interaction of Plant Protective Sys & Control Sys Against FSAR Criteria 19-22 within 60 Days as Followup to LER 87-020

ML20154K887
Person / Time
Site:	Fort Saint Vrain
Issue date:	09/20/1988
From:	Heitner K Office of Nuclear Reactor Regulation
To:	Robert Williams PUBLIC SERVICE CO. OF COLORADO
References
TAC-69264, NUDOCS 8809260037
Download: ML20154K887 (5)

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September 20, 1988 Docket No. 50-267 Mr. R. O. Williams, Jr.

Vice President Nuclear Operations Public Service Company of Colorado Post Office Box 840 Denver, Colorado 80201-0840

SUBJECT:

FOLLOWUPTOLER87-020(TACNO.69264)

We have reviewed your LER 87-020 dated October 1,1987(?-87346). This LER contains a discussion about the Plant Protective System (PPS) as follows:

"First-in-with-lockout logic is provided into the PPS to prevent automatic shutdown of both loops. This lockout features is overridden in the event of a high energy line break by SLRDIS, which automatically closes the feedwater block and control valves of both loops siruitaneously. There are also interlocks provided in the control circuits of the feedwater block valves and feedwater flow centrol valves which prevent closing both loop feedwater control vehes at the same time."

The staff io concerned about the potential interactions of the PPS and control system, both of which provide ontputs to the feedwater block and flow centrol valves.

In particular, we are conce.'ied that the control circuits could override PPS or SLRDIS actions and prevent nernplishnent of the required protective functions.

We would appreciate your ruview of these potential interactions against Criterion 19, 20, 21, and 2? of your FSAR.

Please provide the results of your review to us withiri C0 days of the date of this letter.

The information requested in this letter affects fewer than 10 respondents; therefore, CMB clearance is not required under P.L.90-511.

Sincerely,

/s/

renneth L acn s Project Manager Project D.,4

- IV s

Division of ke tor Projects - III, i

IV, V and Special Projects cc:

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Hr. R. O. Williares, Jr.

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Vice President, Neclear Operations J

P.;blic Service Company of Colorado Post Office Sc 840 Ocover, Colorado 80201-0040 Oca: Mr. Williarrs:

SUBJECT:

FOLLOW UP TO LER 87-020 (TAC NO. 69264)

We have reviewed your LER 87-070 da ted October 1,1987 (P-87346). This LER contains a dinussion ateut the Plant Protective System (PPS) systeni es follows:

"First-in-with-lockout logic is provided into the PPS to prevent autoratic s

shi dcwn of both loops.

This lockout features is overridden in the event of, high uiergy line t'reak by SLRDIS, which autontatically closes the feedwatet block and control volves of both loops simultanc usly. There are also inte*;ocks provided in the control cir"rt+s of the feedwater b'cck valvcs and feedwater flow control valves which prevent closing both loup feedt ater control valves at the sane tine."

Re staff is concerned about the potential interactich. of the PPS and control systen, both of which provide cutputs to the feedwater block and flow control valus.

In particular, we are concerned that the control circuits could override PPS or SLRDIS actions and r' event accenplishnent of the required protective functions.

We would appreciate your revier of these potential interacticns against Criterion

'9. PC, Pl. and EP of your FSAR.

Please provide the results of your review to us within f0 days of the date of this letter.

The infoivaticn requested ir. this letter affects fewer thar.10 respordents; therefore, CMB clearance is not required under P.L. 96-S11.

Sincerely, renneth L. Heitner, Project Pana. -

Project Directarate - IV Divi d n of Reactor Projects - III, IV, Y and Special Projects cc:

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S:ptember 20, 1988 Docket No. 50-267 Mr. R. O. Williams, Jr.

Vice President, Nuclear Operations Public Service Corpany of Colorado Post Office Box 840 Denver, Colorado 80201-0840

SUBJECT:

FOLLOWUPTOLER87-020(TACNO.69264)

We have reviewed your LER 87-020 dated October 1,1987 (P-87340). This LER contains a discussion about the Plant Prctective System (PPS) as follows:

"First-in-with-lockout logic is provided into the PPS to prevent automatic shutdown of both loops. This lockout features is overridden in the event of a high energy line break by S'.RDIS, which automatically closes the feedwater block and control valves of both loops simultaneously. There are also interlocks provided in the control circuits of the feedwater block valves and feedwater flow control valves which prevent closing both loop feedwater control valves at the sare time."

The staff is concerned about the potential interactions of the PPS and control system, both of which provide outputs to the feecwater block end flow control valves.

In particular, we are concerned that the control circuits could override PPS or SLRDIS actions and prevent accorplishner.t of the required protective functions.

We would appreciate ycur review of these potential interactions against Criterion 19, 20, 21, and ?? of your FEAR.

[

Please provide the results of your review: to us within C0 days of the date of this letter.

The information tr. quested in this letter affects fewer than 10 respondents; therefore, CFC clearance is not required under P.L.90-511.

Sincerely,

/s/

Kenneth L. Heitner, Project Manager Project Directorate - IV Division of Reactor Projects - III, IV, V and Special Projects cc: See ne.

page DISTRIBUTION Docket File NRC PDR Local PDR PD4 Reading L. Rubenstein J. Calvo P. Noonan K. Heitner OGC-Rockville E. Jordan B. Grires ACR3 (10)

PD4 Plant File

• See previcus concurrences:

PO4/LA*

PO4/PM*

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%, *.... j September 20, 1988 Docket No. 50-267 Mr. R. O. Williams, Jr.

Vice President. Nuclear Operations Public Service Corrpany of Colortdo Post Office Box 840 Denver, Colorado 80201-0840

SUBJECT:

FOLLOWUPTOLER87-020(TACNO.69264)

WehavereviewedyourLER67-020datedOctober1,1987(P-67346). This LER contains a discussion about the Plant Protective System (PPS) as follows:

"Hrst-in-with-lockout logic is provided into the PPS to prevent automatic shutdown of both loops. This lockout feature is overridden in the event of a high energy line break by SLRDIS, which automatically closes the feedkater block and control valves of both lo?ps simultaneously, There are also interlocks provided in the control circuits of the feecwater block valves and feedwater flow control valves which prevent closing t'oth loop feedwater control valves at the same time."

The staff is concerned about the potential interactions of the PPS and control system, both of which provide outputs to the fee Gater b1:ck and flow contral valves.

In particular, we are concerned that the. control circuits could override PPS or SLRDIS actions and prevent accomplishnent of the required protective functions.

We would appreciate ycur review of these potentsal interactions against Criterien 19, 20, 71, and ?? of your FSAR.

Please provide the results of your review to us within 60 days of the date of this letter.

The information requested in this letter affects fewer than 10 respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincerely, Kenneth L. Heitner, Project Manager Project Directorate - IV Division of Reactor Projects - III, IV, Y and Special Projects cc: See next page

'Mr. R. O. Williams, Jr.

Public Service Company of Colorado Fort St. Vrain cc:

Mr. D. W. Waterbourg, Manager Albert J. Hazle, Director Nuclear Engineering Division Radiation Control Division Public Service Company Department of Health of Colorndo 4210 East lith Avenue P. O. Box 840 Denver, Colorado 80220 Denver, Colorado 80201-C'A0 Mr. David Alberstein, 14/159A Mr. R. O. Williams, Jr., Acting Manager GA Technologies Inc.

Nuclear Production Division Post Office Sox 85608 Public Service Company of Colorado San Diego, California 92138 16805 Weld County Road 19-1/2 Platteville, Colorado 80651 Mr. H. L. Brey, Manager Nuclear Licensing and Fuel Division Pr. P. F. Tomlinson, Manager Public Service Company of Colorado (uality Assurance Division P. O. Box 840 Public Service Company of Colorado Denver, Colorndo 80201-0840 16805 Weld County Road 19-1/2 Platteville, Colorado 80651 Senior Resident Inspector U.S. Nuclear Regulatory Comission Vr. R. F. Walker P. O. Box 640 Public Service Company of Colorado Platteville, Colorado 80651 Post Office Box 840 Denver, Colorado 80201-0840 Kelley, Stansfield & 0'Donnell Public Service Company Building Comitment Centrol Progran i

Room 900 Coordinator 550 15th Street Pub'ic Service Company of Colorado Denver, Colorado 80202 2426 W. 26th Ave. Suite 100-0 Denver, Colorado 80211 Regional Administrator, Region IV U.S. Nuclear Regulatory Comission 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011 I

Chairman, Board of County Comissioners I

of Weld County, Colorado Greeley, Colorado 80631 Regional Representative Radiation Prograr.s Environmental Protection Agency 1 Denver Place 999 18th Street, Suite 1300 Denver. Coloraco 80202-2413

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