IR 05000309/1985025
| ML20137Y934 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 09/26/1985 |
| From: | Elsasser T, Wenzinger E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20137Y919 | List: |
| References | |
| 50-309-85-25-EC, NUDOCS 8510080121 | |
| Download: ML20137Y934 (23) | |
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U.S. NUCLEAR REGULATORY COMMISSION
REGION I
Docket / Report: 50-309/85-25 License:
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Licensee:
Maine Yankee Atomic Power Company 83 Edison Drive
,
Augusta, Maine 04336 l
l Facility:
Maine Yankee Atomic Power Plant l
l Meeting Date:
September 9,198 #
Jf[85 Reported by:
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1. C s sseh~dC,Hief, Reactor Projects Section 3C Date Approved by:
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E. C. Wenzi6ger, le Projects Branch No. 3 Date l
Summa ry:
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An Enforcement Conference was conducted in the NRC Region I Office to discuss the l
circumstances surrounding the discovery of nine shut root isolation valves for the Steam Generator Pressure Transmitters which rendered pressure Channels B, C, and D and their associated protective functions inoperable.
Also discussed was the discovery of the inoperability of the Channel A Steam Generator Low Pressure trip i
function for the Reactor Protective System due to an inadequate design modification.
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The root cause of the events and the corrective action to prevent recurrence were
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outlined by the licensee.
The corrective actions included an in-depth plan for control of all root valves as well as a review of past plant modifications and a
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l functional test program to evaluate proper installation of those modifications.
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gfUCMOD000309 I 001003 l*l I
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DETAILS 1.
Meeting Attendees Maine Yankee Atomic Power Company J. B. Randazza, Executive Vice President C. D. Frizzle, Vice President - Manager of Operations E. T. Boulette, Assistant Plant Manager G. D. Whittier, Manager, Nuclear Engineering and Licensing
Yankee Atomic Electric Company P. L. Anderson, Maine Yankee Project Manager P. A. Bergeron, Manager, Transient Analysis W. H. Reed, I&C Lead Engineer USNRC T. E. Murley, Regional Administrator, Region !
J. M. Allan, Deputy Regional Administrator, Region I W. F. Kane, Ooputy Ofrector, Olvision of Reactor Projects (DPR), Region !
J. Gutierrez, Regional Counsel, Region !
D. Holody, Enforcement Specialist, Region !
E. C. Wenzinger, Chief, Projects Branch No. 3, ORP, Region I T. C. Elsasser, Chief, Reactor Projects Section 3C, DRP, Region !
L. Bettonhausen, Chief, Operations Branch, Division of Reactor Safety (DRS)
ReOlon 1 J. R. Johnson, Chief, Operational Programs Section DRS, Region !
E. Butcher, Acting Chief, Operating Reactors Oranch No. 3 Division of Licensing NRR P. K. Eapen, Chlef, Quality Assurance, DRS, Region !
C. Holden. Senior Resident Inspector 2.
Moctina Purpose To discuss the circumstances surrounding the discovery of nine shut root valves for the Steam Generator Pressure Transmitters associated with pressure Channels H. C, and D, and the discovery of an inoperable Channel A Steam Gen-erator Low Pressure trip function for the Reactor Protective System due to an inadequate design modification.
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Items Discuened ihn following items were discussed:
Circumstances surrounding the two events.
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Root causes that contributed to the events.
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i Safety significance of an inoperable Steam Generator Pressure function.
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The potential effect of design review and testing deficiencies on plant
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systems as a result of past and current modifications.
Corrective action, both short and long term, taken to resolve both events,
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Results At the meeting, the licensee agreed to submit to NRC Region I formal documen-
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tation of those corrective actions presented at the Enforcement Conference l
which will be implemented to correct and prevent recurrence of these events.
l Attached to this report are the viewgraphs presented during the meeting.
l Several of these viewgraphs outline the licensee's proposed corrective ac-
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BEST ESTIMATE ASSESSMENT OF CONSEQUENCES TRANSIENTS IMPACTED
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ASSESSMENT OF SEQUENCE OF BACKUP REACTOR TRIPS
POTENTIAL FAILED FUEL FROM A RETURN-TO-POWER AT E0C
P0TENTIAL FOR CONTAINMENT OVERPRESSURE FOR UPSTREAM
BREAKS t
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9720N-CDF-85-54
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RESULTS BACKUP REACTOR TRIPS
TYPICALLY LOW SG PRESSURE TRIP WOULD OCCUR - 2
SECONDS FOR MSLB DELTA T POWER - <10 SEC.
- HIGH NUCLEAR FLUX * -<C10 SEC.
- CONTAINMENT PRESSURE (5 PSIG) -<(5 SEC.
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SG LEVEL - (INSTANTANE0US?)
- DEPENDENT ON BURNUP
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9720N-CDF-85-54
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RESULTS RETURN-TO-POWER
BEST ESTIMATE REACTIVITY BALANCE (HFP & HZP)
CEA WORTH AVAILABLE
MODERATOR DEFECT T0 60*F
'
D0PPLER DEFECT T0 60*F
MAXIMUM STUCK R0D
NO CREDIT FOR BORON INJECTION (FROM SI)
0.3% DELTA RH0 SUBCRITICAL
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97,].0N-CDF-85-54
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RESULTS CONTAINMENT PRESSURE
NRV LIMITS BLOWDOWN TO ONE SG
TURBINE TRIP CLOSURE ON FWRV LIMITS FEEDWATER TO
WITHIN LICENSING ANALYSIS i
PEAK PRESSURE DESIGN OF 55 PSIG
i 9720N-CDF-85-54
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DESIGN CHANGE PROCESS REVISIONS 1.
MODIFY DESIGN CHANGE INPUT REQUIREMENTS TO SPECIFICALLY
'
IDENTIFY INSTRUMENTATION COMMONING AS AN AREA THAT REQUIRES SPECIAL DESIGN AND DESIGN REVIEW EMPHASIS.
II.
MODIFY DESIGN CHANGE FUNCTIONAL TEST REQUIREMENTS TO SPECIFY MORE COMPREHENSIVE FUNCTIONAL TESTS.
FUNCTIONAL TESTS SHOULD G0 BEYOND THE MODIFIED CIRCUIT TO INCLUDE INTERACTIVE CIRCUITS.
Ill.
INDEPENDENT REVIEW BY COMBUSTION ENGINEERING OF ALL DESIGN CHANGES WHICH AFFECT THE REACTOR PROTECTIVE SYSTEM OR THE ECCS ACTUATION SYSTEMS.
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9720N-CDF-85-54 i
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FUNCTIONAL TEST PROGRAM I.
SCOPE A.
SYSTEMS IDENTIFIED IN TABLE 4.1 0F TECH. SPECS.
B.
COMPLETE TEST (INPUT TO FINAL ACTION) AS PRACTICAL II.
METHOD A.
TEST OBJECTIVE COMMITTEE MULTIDISCIPLINED COMMITTEE TO REVIEW FSAR DESIGN REQUIREMENTS AND OUTLINE APPROPRIATE TEST OBJECTIVES.
B.
TEST PROCEDURE PREPARATION AND REVIEW TASK FORCE CONSISTING OF MY, YNSD AND CE PERSONNEL TO PREPARE AND/0R REVIEW EXISTING FUNCTIONAL TEST PROCEDURES TO ENSURE TEST OBJECTIVES ARE MET.
Ill.
IMPLEMENTATION
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ALL FUNCTIONAL TESTS COMPLETED AND DOCUMENTED PRIOR TO PLANT POWER OPERATION.
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9720N-CDF-85-54
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STEAM GENERATOR PRESSURE INSTRUMENTATION CORRECTIVE ACTION 1.
IMMEDIATE REDESIGN SMM TO ELIMINATE COMMON II.
SUBSEQUENT A.
DESIGN REVIEW B.
FUNCTIONAL TEST PROGRAM
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III.
TO PREVENT RECURRENCE DESIGN CHANGE PROCESS REVISIONS
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9720N-CDF-85-54
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CORRECTIVE ACTIONS
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1. IDENTIFY ROOT CAUSE
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-INADEQUATE DESIGN REVIEW-INAPPROPRIATE FUNCTIONAL TESTING
.... 2. REVIEW EDCRs 3. COMPREHENSIVE FUNCTIONAL TESTING OF SAFETY CIRCUlTS
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DESIGN REVIEW I.
SCOPE ALL DESIGN CHANGES WHICH INVOLVE DIRECTLY OR INTERACT WITH THE SYSTEMS LISTED IN TECH. SPEC. 4.1.
II.
PURPOSE A.
REVIEW FOR POTENTIAL "COMMONING" PROBLEMS B.
REVIEW FOR ANY OTHER " INTERACTION" PROBLEMS III.
RESPONSIBILITY YNSD IV.
INDEPENDENT REVIEW COMBUSTION ENGINEERING
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9720N-CDF-85-54