ML20137Q272

Discusses 970127 Meeting W/Licensee in Lisle,Il to Discuss Actions Re Inadvertent Pressurizer Power Operated Rv Actuation During Cooldown on Plant Reactor.List of Attendees & Licensee Presentations Encl

ML20137Q272
Person / Time
Site:	Braidwood
Issue date:	03/13/1997
From:	Lanksbury R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:	Stanley H COMMONWEALTH EDISON CO.
References
NUDOCS 9704100194
Download: ML20137Q272 (26)

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March 13, 1997 Mr. H. G. Stanley Y Site Vice President l Braidwood Station i Commonwealth Edison Company RR #1, Box B4 Braceville,IL 60407

SUBJECT:

BRAIDWOOD MANAGEMENT MEETING

Dear Mr. dtanley:

This refers to the meeting conducted at the NRC Region lli Office in Lisle, Illinois on January 27,1997. The meeting was to discuss your actions related to the inadvertent 1

. pressurizer power operated relief valve actuation during cooldown on the Braidwood Unit 1 reactor. This issue is discussed in detail in inspection Report (50-456/96018(DRP)). The topics discussed included our findings and your related corrective actions both completed and planned.

In accordance with Section 2.790 of the NRC's " Rules of Practice," Part 2, Title 10, Code of Federal Regulations, a copy of this letter with Enclosures 1 and 2 will be placed in the NRC's Public Document Room.

We appreciated your cooperation in this matter. If you have any questions regarding this meeting, please contact me at 630/829-9631.

Sincerely,

/s/ R. D. LanKsbury Roger D. Lanksbury, Chief Reactor Projects Branch 3 g[

Docket No. 50-456 Docket No. 50-457 10H IN3WO300 3n90d Enclosures S C 0 Af L Z W W 1 6.

1. List of Attendees (

2. Licensee Presentation l

DOCUMENT NAME: A:\ BRA-MGMTG.LTR i To receive a copy of this document, indicate in the box "C" = Copy without attach /enci "E" = Copy with attach / encl "N" = No copy OFFICE Rlli C ' Rlli d NAME Tongue /ca>(>b Lanksbury M b j DATE 3/0/97 3/iY97 OFFICIAL RECOR D COPY I 9704100194 970313

, PDR ADOCK 05000456  !

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H. G. Stanley ,

cc w/o encl: T. J. Meiman, Senior Vee President i Nuclear Operations Division D. A. Sager, Vice President, Generation Support ,

H. W. Keiser, Chief Nuclear Operating Officer T. Tulon, Station Manager ',

T. Simpkin, Regulatory Assurance Supervisor

1. Johnson, Acting Nuclear -

Regulatory Services Manager cc w/ encl: Richard Hubbard Nathan Schloss, Economist ,

Office of the Attorney General State Liaison Officer Chairman, Illinois Commerce Commission Document Control Desk-Licensing Distnbution Docket File w/ encl DRP w/enci OC/LFDCB w/enct Rill PRR w/enct PUB /enci CAA1 w/enci(E-mail)

SRI B@yron, Braidwood, Zion w/enct Rill Enf Coordinator, w/enci Project Mgr., NRR w/ encl A. B. Beach, w/enci i RAC1 (E-Mail) Deputy RA, w/ encl TSS w/enci DRS (3) 4 e

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-i Enclosure 1  !

l List of Attendees  ;

Licensee ,

i E. Stanley, Site Vice President, Braidwood i D. Sager, Vice President, Generation Support T. Tulon, Station Manager, Braidwood R. Wegner, Operations Manager, Braidwood R. Lemke, Offsite Review '

D. Hoots, Unit 1 Operating Engineer, Braidwood -

T. Sirnpkin, Regulatory Assurance Supervisor, Braidwood i

H. Pontious, Jr. Nuclear Licensing Administrator i NRC e J. Grobe, Deputy Director, Division of Reactor Projects, Rill  !

R. Lanksbury, Chief, Branch 3, Division of Reactor Projects, Rlli  !

T. Tongue, Project Engineer, Division of Reactor Projects, Rill C. Phillips, Senior Resident inspector, Braidwood l i

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ENCIDSLEE 2 i

i Braidwood Station .

l Management Meeting i

January 27,1997 1

Inac.vertent Pressurizer .

PORV Actuation October 12,1996

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Agenda Opening Remarks Tim Tulon Overview of Event Bob Wegner Causes Bob Wegner

• Corrective Actions Bob Wegner

• Other Issues All

• Closing Comments Gene Stanley 3

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Event Xarrative 10/12/96 - El Shutdown for Planned Maintenance Outage (Steam Generator Mic. cycle}

Plant Cooldown L sing Steam Dumps and Steam Generator PORVs 5

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Event Xarrative

• Pressurizer Level Maintained at approximately 80% per BwGP 100-5 Demand on Charging Flow Control Valve

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1CV121 was Reduced to Maintain Pressurizer Level

• HLA Briefing Was Held to Discuss Evolution of Placing 1B RH Trainin Shutdown Cooling Mode 6

Event Narrative XSO controlling Pressurizer Level Xoted Charging Flow Oscillations

- Flow was Difficu t to Control due to Large DP Across ValvelCV121 .

- Pressurizer Level nac Begun to Slowly Increase

- XSO Received Permission from Unit Supervisor to Bypass 1CV121 to Allow Finer Control of Charging Flow - 1BwOA PRI-1 was Referenced 7

j Event Xarrative F

• CV Excess Letdown Placed in Service to

Aid in Controlling Pressurizer Level.

Actions Were Progressing to place 1B RH Train in Shutdown Cooling Mode g

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Event Xarrative 1CV121 BypassValve 1CV8387B was 4

Manually Cracked Open .

- Pressurizer Level Increased at Higher Rate

- Unexpected Difficulty Encountered in '

4 Operating 1CV8384A (Upstream Isolation to 1CV121) and 1CV8387B 4

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Event Xarrative 4

• Pzr Pressure Continued to Increase

- Demand Manually Increased on Pressurizer Sarays

- Pressurizer Heaters were Manually Deenergized

- 1CV8105 was Closed by XSO to Isolate

! Charging Flow as Plant Approacaed Solid Conditions

- Pressurizer PORV1RY455A Automatically '

Opened One Time to Relieve RCS Pressure 10

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Event Narrative 1B CV Pum:p was Manually Tripped to l Halt Input to RCS i RCPs Trip;pec. c ue to loss of Sea:. Injection

• Shift Engineer Directed Crew to Stabilize Conditions - Plant Conditions Verified Stable

• Established RH Letdown to Restore

. Pressurizer Level .

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• CV121 Behavior is Unstable Lnder Low Flow / High DP Conditions

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• Inadec uate Communications

- HLA Did Not Address Effects of Past Operating Characteristics of 1CV121 1

- Insufficient Details Were Provided to Operator Instructed to Crack Open 1CV8387B to Bypass 1CV121 13

Causes

• Procedure Guidance .

- BwGP 100-5 Allowed Level to Be

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Maintained at 80% with Reduced Letdown and Charging Control .

- No Hold Point for Evolution

- Sufficient Instructions were Not Available to Bypass CV121 14

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l Corrective Actions

• Engineering and Operations Evaluating Possible Im arovements to Flow Control of CV121 Valves for High OP Evolutions

- CV121 has been added to Operator Workaround list

- Survey of Industry Experience with CV121 in Progress

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Corrective Actions a Communications

- HLA Enhancements

- Holc Points addec. to BwGP 100-5

- Scorecard Program 17 J

Corrective Actions l

• BwGPs Reviewed and Revised

- Lowered Pressurizer Level to 50%

- Addition of Hold Points i

1/2 BwOP CV-27 Written to Provide Guidance on CV121 Manipulation at High i

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Corrective Actions Training i

- Startup/ Shutdown Evolutions were Evaluated

"; ~ust in Time" Training -

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• Event d. etat s were provided to Operating personnel 19 L ,

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Other Issues

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- Outage Template

- Planned Evolution was Safe and Conservative

- Operations Planning 21

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l Closing Comments l

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• We understand the issues of concern to

the XRC and I believe we have demonstrated to you that we have a

thorough und'erstanding of the issues, as we have discussed, and are taking

appropriate corrective actions. .

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