ML17312B706
| ML17312B706 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/02/1997 |
| From: | Thomas K NRC (Affiliation Not Assigned) |
| To: | James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| References | |
| NUDOCS 9710060455 | |
| Download: ML17312B706 (23) | |
Text
October 2, 1997 Mr. James M. Levine Executive Vice President, Nuclear Arizona Public Service Company Post Office Box 53999
- Phoenix, Arizona 85072-3999
SUBJECT:
NRC VISIT TO THE PALO VERDE NUCLEAR GENERATING STATION TO DISCUSS AIR-OPERATED VALVE ISSUES
Dear Mr. Levine:
Thank you for hosting the NRC's Office for Analysis and Evaluation of Operational Data (AEOD), and the Idaho National Engineering and Environmental Laboratory
( INEEL) to visit your site on October 28 and 29, 1997. to discuss air-operated valve (AOV) issues (design, operation, testing, maintenance, etc.).
Your plant is one of approximately seven that will be visited to help the NRC better understand plant operational experience in the area of AOVs.
The information gathered on these visits will be combined with overall industry experience and risk assessments in order to assist the NRC in determining whether or not a generic communication such as Generic Letter 89-10, which was issued for motor -operated valves (HOVs), is needed for AOVs.
Important issues to be considered are lessons learned, if any, from the MOV programs and benefits. if any, that may have resulted from activities associated with the implementation of the Maintenance Rule.
Enclosed are copies of pages from the AOV Study Program Plan which provide details of the study and contain examples of some of the items which we would like to learn about during the visit.
If you have any questions regarding the visit, please contact me at (301) 415-1362.
Sincerely, Original Signed By Kristine H. Thomas, Project Manager Project Directorate IV-2 Division of Reactor Projects
- III/IV Office of'uclear Reactor Regulation Docket Nos.
STN 50-528.
STN 50-529 and STN 50-530
Enclosure:
Page's from AOV Study Program Plan cc w/encl:
See next page DISTRIBUTION:
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2055&0001 October 2,
1997 Nr. James N. Levine Executive Vice President, Nuclear Arizona Public Service Company Post Office Box 53999 Phoenix. Arizona 85072-3999
SUBJECT:
NRC VISIT TO THE PALO VERDE NUCLEAR GENERATING STATION TO DISCUSS AIR-OPERATED VALVE ISSUES
Dear Nr. Levine:
Thank you for hosting the NRC's Office for Analysis and Evaluation of Operational Data (AEOD), and the Idaho National Engineering and Environmental Laboratory (INEEL) to visit your site on October 28 and 29, 1997, to discuss air-operated valve (AOV) issues (design, operation, testing, maintenance, etc.).
Your plant is one of'pproximately seven that will be visited to help the NRC better under stand plant operational experience in the area of AOVs.
The information gathered on these visits will be combined with overall industry experience and risk assessments in order to assist the NRC in determining whether or not a generic communication such as Generic Letter 89-10, which was issued for motor-operated valves (NOVs), is needed for AOVs.
Important issues to be considered are lessons learned. if any, from the NOV programs and benefits, if any, that may have resulted from activities associated with the implementation of the Naintenance Rule.
Enclosed are copies of pages from the AOV Study Program Plan which provide details of the study and contain examples of some of the items which we would like to learn about during the visit.
If you have any questions regarding the visit, please contact me at (301) 415-1362.
Sincerely, Docket Nos.
STN 50-528, STN 50-529 and STN 50-530
Enclosure:
Pages from AOV Study Program Plan cc w/encl:
See next page th:TYu~~
Kristine N.. Thomas, Project Nanager Project Directorate IV-2 Division of Reactor Projects
- III/IV Office of Nuclear Reactor Regulation
Hr. James H. Levine October 2, 1997 cc w/att:
Hr. Steve Olea Arizona Corporation Commission 1200 W. Washington Street Phoenix, Arizona 85007 Douglas Kent Porter Senior Counsel Southern California Edison Company Law Department, Generation Resources P.O.
Box 800
- Rosemead, Cali forni a 91770 Senior Resident Inspector USNRC P. 0.
Box 40 Buckeye, Arizona 85326 Regional Administrator, Region IV U. S. Nuclear Regulatory Commission Harris Tower
& Payillion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064
- Chairman, Board of Supervisors ATM:
Chairman 301 W, Jefferson, 10th Floor Phoenix.
Arizona 85003 Hr. Aubrey V. Godwin, Director Arizona Radiation Regulatory Agency 4814 South 40 Street Phoenix, Arizona 85040 Hs. Angela K. Krainik. Manager Nuclear Licensing Arizona Public Service Company P.O.
Box 52034 Phoenix, Arizona 85072-2034 Hr. John C. Horne. Vice President Power Supply Palo Verde Services 2025 N. Third Street.
Suite 220
- Phoenix, Arizona 85004 Mr. David Summers Public Service Company of New Mexico 414 Silver SW, f0604 Albuquerque.
New Mexico 87102 Hr. Robert D. Bledsoe Southern California Edison Company 14300 Mesa
- Road, Drop D41-SONGS San Clemente, California 92672 Hr. Robert Henry Salt River Project 6504 East Thomas Road Scottsdale.
Arizona 85251 Terry Bassham, Esq.
General Counsel El Paso Electric Company 123 W. Mills El Paso, Texas 79901 Hr. Robert Burt Los Angeles Department of Water
& Power Southern California Public Power Authority 111 North Hope Street, Room 1255-B Los Angeles. California 90051
rd I
JCN E8238, Task Order No. 15, 8tudy, of AOVs INEELI LMITCO X.
A.
The following 7 (choose from list) sites willbe visited in accordance with the following approximate schedule:
PLANT NAME Millstone Diablo Canyon Palo Verde LaSalle Palisades Grand Gulf North Anna Fermi Peach Bottom Crystal River 5avi's.'.bess e Turkey Point SCHEDULED VISIT January 1998 To Be Determined (TBD)
Mid-'Novamber~),997i TBD TBD TBD TBD (Early November 1997)
TBD TBD TBD The following plant-speciTic information is to be obtained prior to site visits, if practical.
Furnish a description to the plant point-of-contact of the information in-
. hand and the information and data to be collected on-site.
Failure data, a.
Events (LERs, Bulletins, Notices, etc. specific to this plant),
b.
Recurring failures specific to this plant (Common cause or common mode),
c.
Number and types of failures, events, or precursors, (1)
Safety-related, (2)
Other pertinent, 2.
PRA application and data use, a.
How are plant PRA and PRA tools used in plant, relationship to Maintenance Rule' b.
Are predictive and preventive maintenance tasks based on PRA calculations7 3.
Maintenance Data and Diagnostic systems in use, a.
Description, Ni%isice'2
JCN E8238, Task Order No. 15, gtijdjofAOVs INEELI LMITCO 4.
b.
- Methods, c.
Frequency, d.
Results and description of the data collected.
d.
e.
f.
g Design data:
a.
Number ofAOVs (1)
Safety-related (2)
Important non-safety related AOVs (as defined previously) b.
Types of AOVs (1)
Diaphragm, piston, etc.
(2)
Controllers, regulators, etc.
c.
Air(and/or inert gas) supply system description (1)
Number, type, size of pumps (2)
Supply system description (3)
Filters, regulators, etc.
(4)
Backup and protocol Breakdown of air system service and AOVuse by system Sizes of AOVs and operators in use Operating and process fluids Selection and sizing methods tra'j'sic@'t.md::acciden't cogditiqny>
C.
Personnel to be contacted prior to each site visit should include:
2.
3.
4, Headquarters, regional and on-site NRC personnel, a.
NRC plant project manager, b.
Cognizant NRC Region staff, c.
NRC Resident Inspector, Plant maintenance staff representatives, Plant engineering staff representatives, Plant and utilitymanagement representatives.
D.
Interv 1.
2.
3.
4, 5.
6.
7.
iew information to be obtained on-site should include:
Name(s) of interviewer(s) and titles, Date(s) of visit, Plant name and docket number, Person(s) interviewed, titles, phone numbers, E-mail, addresses, etc.
Describe organization and position of the person interviewed.
Provide information on overall number of AOVs, air system, AOVs broken down by system, ifsuch information was not obtained prior to the visit.
Describe events involving AOVs and air systems including:
a.
- Recent, b.
Recurring, c.
Significant (regardless of time frame).
Describe AOVfailures.
a.
Actual and potential, b.
Common cause or common mode.
Describe actions taken after AOVevents or failures.
kivr'st 2 8'eptemQr:.: f6;-.'1997>>
I
JCN E8238, Task Order No. 15, 8/i' of AOVs
~ INEEL/ LMITCO 10.
12.
13.
14.
15.
a.
Immediate, b.
Follow-up.
Describe root cause analyses.
a.
Lessons learned regarding AOVs, b.
Unique procedures for AOVs, ifany.
Describe maintenance and IST procedures forAOVs.
a.
Safety-related, important non-safety-related (as defined previously), other non-safety-related, b.
What procedures, ifany, are vendor approved and/or supervised'P c.
ASME and other code requirements, d.
Describe maintenance, test, and analysis resources available.
(1)
On site, corporate, consulting, industry, etc.
Describe diagnostic systems used for AOVs.
a.
Description, b.
Specifications, c.
Data collected, d.
Availabilityto plant staff, e.
Frequency of use.
f.
Vendor approved and/or supervised Describe design (and analysis) procedures for AOVs.
a.
Design bases, b.
Vendor approved and/or supervised.
Describe training for installation, maintenance, and testing of AOVs.
Note: Emphasize to all site personnel interviewed that this is a fact-finding visit for information applicable to all plants and the information to be collected willnot be used to reflect negatively on the specific plant performance.
We do not intend to subject any single plant to criticism.
E.
Examine design, maintenance, failure, or event records ifpractical
~
1.
Describe maintenance, failure or event database and processes for the plant.'.
Assessment of availability, accuracy, completeness, b.
Obtain copies of examples ifpossible.
2.
Assess overall capability of plant personnel regarding AOV:
a.
- design, b.
equipment qualification, c.
maintenance, d.
- testing, e.
failure and events analyses.
F.
View representative AOVs, ifpractical.
1.
In situ, 2.
In shop, storage, or test facilities G.
Trip reports for each site visit should be prepared within two weeks of the end of each visit, ifpractical.
1.
Trip reports should be submitted to the NRC TM.
JCN E8238, Task Order No. 15, 8tu'8y. of AOVs INEELI LMITCO 2.
Include information obtained (as described above).
3.
Furnish copies to NRC PM, Region staff, Resident Inspector, and plant host as a courtesy and to seek feedback.
H.
An interview form is attached to this program plan.
XI.
A.
The Accident Sequence Precursor (ASP) program involves the systematic review and evaluation of operational events or conditions that have occurred at U. S.
commercial light-water reactors, reported under the Licensee Event Report (LER) program.
Precursors and potential severe core damage accident sequences are identified and categorized in the ASP program. The LERs generated from 1969 through 1995 have been evaluated under the ASP program and those LERs that met a screening criteria of the ASP evaluation process were further analyzed to compute conditional core damage probability (CCDP). The events which were not analyzed were considered (in accordance with the screening criteria) to be not risk
'significant with respect to core damage:
ASP models willbe used in two ways to assess AOVrisk significance:
ASP evaluations developed over the period considered in this study willbe reviewed to identify any risk significant ASP AOVand AOVsupport system failures that occurred in operating plants, as well as the conditional core damage probability (CCDP) associated with each of these AOV (or support system) failures.
a.
Although the simplified nature of the ASP models and reporting criteria for the LER means that many plant AOVs are not included in these models (and, thus, many AOVfailures willnot have been evaluated in this way), some AOVfailures may have been included in these ASP analyses and willprovide a useful starting point to understand the risk significance of AOVfailures.
2.
ASP models willbe used to evaluate the CCDP of selected Qgg~fjggf AOVfailures to the extent that the current level of model development will support such evaluation.
B.
In addition to the use of ASP models, the risk significance of AOVand AOV support system failures willbe evaluated by performing limited scope evaluations and sensitivity studies using completed plant SAPHIRE (Systems Analysis Programs for Hands-on Integrated Reliability Evaluations) data bases developed at the INEEL. Selected plant models willbe used to evaluate the relative risk importance of AOVs in selected plant systems and the sensitivity of plant core damage frequency to changes in AOVfailure rates.
1'.
Both independent AOVfailures and common cause AOVfailures willbe considered.
gev<~2 15
JCN E8238, Task Order No. 15, Qtu'dj of AOVs INEELI LMITCO INTERVIEWFORM FOR AIR OPERATED VALVE8TVBg SITE VISITS ITEM No.
Date.
INFORMATION RESPONSE OR INFORMATION Use se arate sheets and refer to item numbers, ifnecessa Name of Interviewer.
Plant Name & Docket No.
Person(s) Interviewed, Title(s), Phone Number(s), E-Mail address, short description of organization(s) and duties.
Ifnecessary, and ifperson(s) interviewed can do so, obtain any missing information not provided prior to the site visit, as described in the outline for Task 4 above.
Note what information was provided.
Describe plant events involving AOVs and provide reference information, if possible.
Recent:
Recurring:
Significant:
Describe AOVor air-system actual or detected potential failures at the plant? Provide reference information, ifpossible.
Describe actions taken after events or failures involving AOVs or the air system.
Provide reference
'information, ifpossible.
19
'l 1
JCN E8238,- Task Order No. 15, 8tg8j of AOVs INEELI LMITCO INTERVIEWFORM FOR AIR OPERATED VALVESTOD~g SITE VISITS iTEM,No.
INFORMATION Were there any actual or potential common mode or common cause failures in the air system or AOVs at the plant'P Describe and provide reference information, ifpossible.
RESPONSE OR INFORMATION Use se arate sheets and refer to item numbers, ifnecessa 10 Describe root cause analysis procedures for the plant. Provide reference information, ifpossible.
Describe root-cause analyses performed for air system or AOV failures at the plant.
Provide reference information, ifpossible.
12 Describe maintenance procedures for the air system.
Provide reference information, ifpossible.
13 Describe maintenance procedures for AOVs. Provide reference information, ifpossible.
Safety-related:
Important non-safety-related:
Non-safety-related:
14 Describe IST procedures for the air system.
Provide reference information, ifpossible.
tSytsiQA,':2 20 8eytem6ir-'06;:,.4,997;
JCN E8238, Task Order No. 15, 8QdjofAOVs INEELI LMITCO INTERVIEWFORM FOR AIR OPERATED VALVESTUD/~
SITE VISITS ITEM No.
15 INFORMATION Describe IST procedures forAOVs.
Provide reference information, if possible.
Safety-related:
Important non-safety-related:
Non-safety-related:
RESPONSE OR INFORMATION Use se arate sheets and refer to item numbers, ifnecessa 16 Describe diagnostic systems, ifany, used for AOVs. Provide reference information, ifpossible.
Description of system:
Specifications:
Data collected and frequency of collection:
Vendor assistance provided, ifany:
17 Describe design (and analysis) procedures for AOVs. Describe how design basis is established and maintained for AOVs. Provide reference information, ifpossible.
19 Eked%! analysesian~ii'.:. estlajj~ifo; gitulated."frans enfor<accidept Inform'abo0 ~8~'cesibl~e~
Describe training for installation, maintenance, and testing of AOVs.
Provide reference information, if possible.
hex!ared
JCN E8238, Task Order No. 15, Biifdgof AOVs INEELI LMITCO INTERVIEWFORM FOR AIR OPERATED VALVE/TULLY.
SITE VISITS ITEM No.
20 INFORMATION Describe databases used to track maintenance, failures, and events regarding AOVs. Provide reference information ifpossible.
On site:
Company wide:
Industry:
RESPONSE OR INFORMATION Use se arate sheets and refer to item numbers, ifnecessa 21 Describe the impact of the Maintenance Rule, 10 CFR 50.65 on AOV and air system maintenance and testing.
Provide reference information ifpossible.
Is PRA data used for predictive maintenance or replacement of AOVs? Ifso, how?
23 Are AOVs serviced on site, serviced offsite, or replaced as piece-parts if found to require service?
24 Describe the most common recurring maintenance problem(s) and failures regarding AOVs and the air system.
Provide reference information if possible.
25 Interviewer comments regarding actual valves viewed during the visit, in the plant, undergoing maintenance or replacement, or in the plant stock system, ifapplicable to this interview.
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J JCN E8238, Task Order No. 15, 8tefy. ofAOYs INEEL/ LMITCO INTERVIEWFORM FOR AIR OPERATED VALVESTUD.'III SITE VISITS ITEM No.
26 INFORMATION Has the plant made changes to valves or systems that include AOVs, or replaced AOVs with different models of AOVs or different valves that are not AOVs?
Ifso, describe the changes and the circumstances.
What prompted the change?
Was the change made for this plant only?
RESPONSE OR INFORMATION Use se arate sheets and refer to item numbers, ifnecessa 27 Does the plant followEPRI/NMAC guidelines for maintaining AOVs and the air system(s)?
Ifnot, describe differences and reasons for the differences.
Provide reference informatioo, ifpossible.
28 What is the plant doing or planning to
~do in res ense to the recent htdosijj correspondence',og'A'OVs'.
Provide reference information, ifpossible.
29 Do you have any suggestions for improving the performance of AOVs, particularly in the areas of surveillance, testing, or maintenance?
Provide a list of 10 CFR 50.59 and 10 CFR 50.72 reports on AOVs and AOV support systems (air or inert gas supply, etc.) that have been issued for this plant.
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