ML20137A743
| ML20137A743 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 03/17/1997 |
| From: | Jain S DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-96-05, GL-96-5, NUDOCS 9703210068 | |
| Download: ML20137A743 (7) | |
Text
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1 e Valley Power Station SNppingport. PA 15077-0004 l
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nVke P esident Fax 41 38 Nuclear Power Olvision March 17, 1997 j
j U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001
Subject:
Beaver Valley Power Station, Unit No. I and No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412,. License No. NPF-73 180-Day Response to Generic Letter 96-05
Reference:
1.
"NRC Generic Letter 96-05: Periodic Verification of Design-Basis Capability of Safety-Related. Motor-Operated Valves,"
dated i
September 18,1996.
This letter provides Duquesne Light Company's (DLC's) 180-day response to Generic Letter 96-05 (Reference 1).
DLC is a member of the Westinghouse Owners Group (WOG) which has established a group tasked with developing a generic periodic verification program to address the issues identified in Generic Letter 96-05. The WOG has determined that it will participate with the Boiling Water Reactors Owners Group in this task. Active l
participation in the WOG will provide a supplementary resource for the review of the Beaver Valley Power Station (BVPS) program. Our schedule for implementation of the periodic verification program at BVPS Unit I and Unit 2, revised to reflect Generic Letter (GL) 96-05, will be in place by the next scheduled refueling outage for Unit I which is scheduled for the fall of 1997. Details of the program are summarized in, "BVPS GL 96-05 MOV Periodic Verification Program Summary." DLC will ensure that the program periodically verifies that safety-related motor-operated valves (MOVs) within the scope af the BVPS Generic Letter 89-10 Program continue to be capable of performing their safety functions within their respective current licensing bases.
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Beaver Valley Power Station, Unit No. I and No. 2 180-Day Response to Generic Letter 96-05
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1 If you have any questions on this submittal, please contact Mr. Roy K. Brosi, Manager, Nuclear Safety Department, at (412) 393-5210.
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Sincerely, Sushil C. Jain i
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Mr. H. J. Miller, NRC Region I Administrator l
Mr. D. M. Kern, Sr. Resident Inspector Mr. D. S. Brinkman, Sr. Project Manager 1
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i AFFIDAVIT i
COMMONWEALTH OF PENNSYLVANIA)
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j COUNTY OF BEAVER
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Subject:
Beaver Valley Power Station, Unit No. I and No. 2 l
BV-1 Docket No. 50-334, License No. DPR-66
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BV-2 Docket No. 50-412, License No. NPF-73 180-Day Response to Generic Letter 96-05 I
j Before me, the undersigned notary public, in and for the County and Conunonwealth aforesaid, this day personally appeared Sushil C. Jain, to me known, i
j who being duly sworn according to law, deposes and says that he is Division Vice President, Nuclear Services of the Nuclear Power Division, Duquesne Light Company, he is duly authorized to execute and file the foregoing submittal on behalf of said Company, and the statements set forth in the submittal are true and correct to the best of his knowledge, information and belief.
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l Sushil C. Jain Subscribed and sworn to before me on this /9 hay of M4 LLb
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Notary Public Notaria! Seal VMan V. Harper. Notary Public s n d p res June $,1993 My rn Mcctor, Perm 1vardaksocatonof Nctanes
1 BVPS GL 96-05 MOV PERIODIC VERIFICATION PROGRAM
SUMMARY
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i Duquesne Light Company is a member of the Westinghouse Owner's Group l
(WOG). It has participated in the WOG effort and development of the Joint Owner's Group (JOG) Periodic Verification (PV) of MOVs Program for Generic Letter (GL) 96-
- 05. In response to GL 96-05, for MOVs included in the scope of Generic Letter 89-10, Beaver Valley will establish a Periodic Verification Program that is consistent with the JOG PV Program.
GL 89-10 and its supplements provide the specific design and functional criteria l
for those safety related MOVs to be included in the scope of the program. Of the total Category 1 safety-related MOVs installed at Beaver Valley Power Station (BVPS) Unit 1 and Unit 2, 219 MOVs are presently included in the GL 89-10 program.
MOVs j
excluded from the GL 89-10 population were evaluated and processed by means of a i
thorough review and approval of the exclusion basis by representatives from Engineering, Operations, and System Engineering. Guidelines have been established within the administrative program for exclusion of MOVs from the 89-10 program, and j
procedures are in place to control this exclusion process.
Numerous MOVs are placed out of Normal System Arrangement (NSA) for c
Operating Surveillance Tests. The " surveillance" MOVs are verified returned to NSA by procedure. For valves on clearance or used as a clearance boundary, they are restored by j
the clearance procedure and verified retumed to NSA. For valves out of NSA and not capable of automatically positioning to the ESF required position, the valve / train is considered out-of-service.
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SUMMARY
OF CURRENT PERIODIC VERIFICATION PROGRAM (GL 89-10)
For all GL 89-10 valves, periodic static MOV testing is currently scheduled within a maximum 5 year frequency or every 3rd refueling outage period (54 months).
Dynamic MOV testing is perfonned using the following guidelines:
a.
" Priority A" MOVs shall be tested on a maximum 5 year frequency or every 3rd refueling outage period (54 months). Priority A valves are those MOVs whose probabilistic risk failure would result in a core damage 4
frequency of greater than 1.0 x 10 events per year. The remaining valves are considered Priority B.
b.
" Priority B" valves are grouped, as deemed appropriate, for dynamic testing purposes based on similarity of construction and service conditions.
These MOVs shall be scheduled for a dynamic test such that at least one of
l BVPS GL 96-05 MOV Periodic Verification Program Summary Page 2 i
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the valves in a designated group is tested within a maximum 5 year frequency or every 3rd refueling outage period (54 months).
Scheduled maintenance tasks for valve motor operators are utilized to perform MOV inspections and stroke testing on a predetermined schedule of 54 months.
Included in this task is an external inspection, limit switch compartment inspection, main i
gearbox lubrication check, manual and electrical stroking of the valve, and the plant's inservice testing (IST) program stroke check. A lubrication inspection is performed on i
the actuator, handwheel, and valve stem every 18 months. Various tasks are scheduled i
as required for component replacement for Environmental Qualification (EQ) j requirements or upgrades to the operator.
SUMMARY
OF FUTURE PERIODIC VERIFICATION PROGRAM (GL 96-05)
At Beaver Valley, the Periodic Verification (PV) program for MOVs for GL 96-05 has been developed that is consistent with the Joint Owners Group (JOG) PV program.
MOVs are to be tested statically with suitable diagnostic test equipment, on a frequency which depends on the safety significance (risk) of the valve and on the functional capability (margin) of the valve. Both the risk and margin categories are divided into three levels, High, Medium, and Low.
l The risk categories focus on the contribution of the valve to calculated core j
damage frequency (CDF).
Where CDF is not a meaningful measure (such as a containment isolation valve) or where the valve is not modeled in the Probabilistic Safety Analysis, the valve is assigned a High risk value until it can be reviewed by an expert panel. After review by the expert panel, a more appropriate risk level may be assigned.
The three margin categories are divided in 5% increments and are a function of available and required actuator outputs. Factors considered for these values are:
a)
Test equipment inaccuracy b)
Torque switch repeatability
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c)
Rate-of-loading / load sensitive behavior d)
Springpack relaxation e)
Stem lubricant degradation f)
Coefficient of friction g)
Packing load h)
Degraded voltage and motor temperature effects 4
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4 BVP.S GL 96-05 MOV Periodic Verification Program Summary
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s Risk and margin categories for testing frequencies were developed that 'are consistent with the JOG PV Program. The testing frequency for each MOV will be l
confirmed after each static test based on the margin and risk categories of the valve.
l MOVs will be tested dynamically to support the JOG PV dynamic test program.
l The differential pressure (D/P) testable valves at Beaver Valley have been identified for inclusion in the JOG PV dynamic test valve matrix. Testing and reporting of the test i
data will be conducted as outlined in the JOG PV Program.
Static and Dynamic testing will also be performed to acquire a new baseline test as required based on an evaluation of the following:
a)
System modifications, piping changes (including replacement or 4
i reconfiguration) i i
b)
Pump rotating element replacement or refurbishment c)
Supply voltage changes; reduction of voltage d)
Valve changes; overhauls; maintenance; or replacement e)
Actuator changes; modifications; maintenance; component replacements including limit and torque switches, motor, springpack, stem nut, and worm / motor pinion gear set.
Testing frequencies for the Periodic Verification Program may be adjusted as recommended by the JOG based on the review / analysis of JOG test results.
MOVs are to continue to be exercised per the plant's inservice testing (IST) program.
Scheduled Maintenance Tasks for Valve Motor Operators will continue to be utilized to perform MOV inspections and stroke testing on a schedule commensurate with the static test frequency. Included in this task is an external inspection, limit switch compartment inspection,. main gearbox lubrication check, manual and electrical stroking of the valve, and IST stroke check. A lubrication inspection will be performed on the actuator, handwheel, and valve stem. Various tasks will continue to be scheduled as required for component replacement for EQ requirements or upgrades to the operator.
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,' EVRS GL 96-05 MOV Periodic Verification Program Summary Page '4 i
i TRENDING l_
Preventive maintenance inspection results will be reviewed for any trends that appear to develop. The results provide an indication of the material condition of the i
operator, correct switch development, and proper valve operation.
Static and dynamic test results will be reviewed and trended. Items that affect these test results will be monitored for any changes that may affect design assumptions.
These items would include:
Valve Factors Stem Coefficients Stem Lubrication Effects l
Packing Loads f
Rate-of Loading / Load Sensitive Behavior li Bearing Coefficients e
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TRANSITION SCHEDULE l
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The implementation schedule for the Periodic Verification program for Beaver Valley Units I and 2, revised to reflect GL 96-05, will be in place at the next scheduled 1
refueling outage which is scheduled for Unit 1 in the Fall of 1997 (1R12). Included m the implementation will be the revision of the administrative and testing procedures, Nuclear Power Division Administrative Procedure (NPDAP) 8.27 is the site administrative procedure utilized to define the MOV Administrative Program for the maintenance and testing of motor operated valves at Beaver Valley Units 1 and 2. It delineates the responsibilities and requirements for ensuring proper motor operated valve operation. This procedure and its supporting procedures will be revised to reflect the JOG Program on MOV PV by the next scheduled refueling outage. In the interim, the current GL 89-10 program requirements for testing, operability, and periodic testing will continue to ensure that all safety related MOVs are capable of performing their design bases functions.
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