ML20137Q272
| 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 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 g[
Roger D. Lanksbury, Chief Reactor Projects Branch 3 Docket No. 50-456 Docket No. 50-457 10H IN3WO300 3n90d Enclosures S C 0 Af L Z W W 1 6.
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1.
List of Attendees 2.
Licensee Presentation 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
Tongue /ca>(>b Lanksbury M b j
NAME 0
DATE 3/ /97 3/iY97 OFFICIAL RECOR D COPY I
9704100194 970313 PDR ADOCK 05000456 ggpppp555 P
PDR 2
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 SRI B@yron, Braidwood, Zion w/enct PUB
/enci CAA1 w/enci(E-mail)
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 List of Attendees Licensee i
i E. Stanley, Site Vice President, Braidwood 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
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ENCIDSLEE 2 i
i Braidwood Station l
Management Meeting i
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January 27,1997 1
Inac.vertent Pressurizer PORV Actuation October 12,1996
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j 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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i Event Xarrative 1CV121 BypassValve 1CV8387B was Manually Cracked Open 4
- Pressurizer Level Increased at Higher Rate
- Unexpected Difficulty Encountered in Operating 1CV8384A (Upstream Isolation 4
to 1CV121) and 1CV8387B 4
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Event Xarrative Pzr Pressure Continued to Increase 4
- 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 11-r y-w e-
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CV121 Behavior is Unstable Lnder Low Flow / High DP Conditions Inadec uate Communications
- HLA Did Not Address Effects of Past Operating Characteristics of 1CV121
- Insufficient Details Were Provided to Operator 1
Instructed to Crack Open 1CV8387B to Bypass 1CV121 13
Causes Procedure Guidance
- BwGP 100-5 Allowed Level to Be Maintained at 80% with Reduced Letdown
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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 16
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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l Corrective Actions Training i
- Startup/ Shutdown Evolutions were Evaluated
";~ust in Time" Training i
Event d. etat s were provided to Operating personnel 19 L
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Other Issues i
a Schedule
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- Outage Template
- Planned Evolution was Safe and Conservative
- Operations Planning 21
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l Closing Comments l
l 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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