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Gentlemen:
The enclosed IE Circular 81-14, " Main Steam Isolation Valve Failure To Close",
is forwarded to you for appropriate action /information. No written response is required.. If you desire additional information regarding this matter, please contact this office.
Sincerely, twsk (
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i Ronald C. Hay d '
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Director
Enclosure:
IE Circular No. 81-14 with 2 Attachments s o CONTACT:
D. L. Caphton 9
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LIST OF HOLDERS CT NUCLEAR POWER REACTOR-0PERATING LICENSES AND CONSTRUCTION PERMITS RECEIVING IE CIRCULAR NO. 81-14
. Baltimore Gas and Electric Company Docket Nos. 50-317 ATTN: Mr. A. E. Lundvall, Jr.
.50-318 Vice President, Supply P. 0.. Box 1475 Baltimore, Maryland 21203 Boston Edison Company M/C Nuclear Docket No. 50-293 ATTN:
Mr. A. V. Morisi Nuclear Operations Support Manager 800 Boylston Street Boston, Massachusetts 02199 Connecticut Yankee Atomic Power Company Docket No. 50-213 ATTN:
Mr. W. G. Counsil Vice President - Nuclear Engineering and Operations P. O. Box 270 Hartford, Connecticut 06101 Consolidated Edison Company of Docket Nos. 50-03 New York, Inc.
50-247 ATTN:
Mr. John D. O'Toole Vice President - Nuclear Engineering and Quality Assurance 4 Irving Place New York, New York 10003 Duquesne Light Company Docket No. 50-334 ATTN:
Mr. J. J. Carey l
1
-Vice President l
Nuclear Division P. O. Box 4 Shippingport, Pennsylvania 15077 Jersey Central Power and Light Company Docket No. 50-219 ATTN:
Mr. Philip R. Clark Vice President - Nuclear GPU Nuclear 100 Interpace Parkway Parsippany, New Jersey 07054 4
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Maine. Yankee Atomic Power Company Docket No. 50-309 ATTN: Mr. Rabert H. Groce Senior Engineer-Licensing 1671 Worcester Road Framingham, Massachusetts 01701 Metropolitan Edison Company Docket No. 50-289 l
ATTN:
Mr. H. D. Hukill Vice President and Director of TMI-l i-P. O. Sox 480 4
Middietown, Pennsylvania 17057 Metropolitan Edison Ccmpany Docket No. 50-320 ATTN:
Mr. J. J. Barton Acting Vice President and Director of TMI-2 i
P. O. Box 480 Middletown, Pennsylvar.fa 17057 Niagara Mohawk Power Corporation Docket No. 50-220' ATTN.
Mr. T. E. Lempges Vice President 4
Nuclear Generation i
300 Erie Boulevard West l
Syracuse, New York 13202 i
Northeast Nuclear Energy Company Docket Nos. 50-336 ATTN:
Mr. W. G. Counsil 50-245 i
Senior Vice President - Nuclear 50-423 Engineering and Operations Group P. O. Box 270 Hartford, Connecticut 06101 Philadelphia E'ectric Company Docket Nos. 50-277 ATTN:
Mr. S. L. Daltroff 50-278 Vice President Electric Production i
2301 Market Street Philadelphia, Pennsylvania 19101 Power Authority of the State of New York Docket No. 50-286 Indian Point 3 Nuclear Power Plant ATTN:
Mr. J. C. Brons.
l Resident Manager P. O. Box 215 i
Buchanan, New York 10511 l
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Power Authority of the State of New York Docket No. 50-333 James A. FitzPatrick Nuclear' Power Plant ATTN: Mr. John D. Leonard Resident Manager P. O. Box 41 Lycoming, New York 13093
.Public Service Electric and Gas Company Docket Nos. 50-272 ATTN: Mr. F. W. Schneider 50-311 Vice President - Production 80 Park Plaza Newark, New Jersey 07101 Rochester Gas and Electric Corporation Docket No. 50-244
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ATTN: Mr. John E. Maier Vice President Electric and Steam Production 89 East Avenue Rochester, New York 14649 Vermont Yankee Nuclear Power Corporation Docket No. 50-271 ATTN:
Mr. Robert L. Smith Licensing Engineer 1671 Worcester Road Framingham, Massachusetts 01701
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L Yankee Atomic Electric Company Docket No. 50-29 ATTN: Mr. James A. Kay Senior Engineer-Licensing 1671 Worcester Road i
Framingham, Massachusetts 01701 Duquesne Light Company Docket No. 50-412 d
ATTN: Mr. E. J. Woolever Vice President 435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Jersey Central Power a Light Company Docket No. 50-363 ATTN: Mr. J. T. Carroll Acting Director Oyster Creek Nuclear Generating Station P. O. Box 388 Forked River, New Jersey 08731 Long Island Lighting Company Docket No. 50-322 ATTN:.-Mr. M. S. Pollock Vice President - Nuclear 175 East Old Country noad Hicksville, New York 11801
.m m
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Niagara Mohawk Power Corporation Docket No. 50-410 ATTN: Mr. Gerald K. Rhode Vice President System Project Management c/o Miss Catherine R. Seibert 300 Erie Boulevard, West
' Syracuse, NY 13202 Pennsylvania Power & Light Company Docket-Nos. 50-387 ATTN: Mr. Norman V. Curtis 50-388 Vice President-Engineering and Construction - Nuclear i
2 North Ninth Street Allentown, Pennsylvania 18101 i
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Philadelphia Electric Company Docket Nos. 50-352 ATTN: Mr. John S. Kemper 50-353 Vice President Engineering and Research-2301 Market Street Philadelpnia, Pennsylvania 19101 Public Service Electric & Gas Company Docket Nos. 50-354 ATTN:
Mr. T. J. Martin 50-355 Vice President Engineering and Construction 80 Park Plaza - 17C
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Newark, New Jersey 07101 Public Service Company of New Hampshire Docket Nos. 50-443 i
ATTN:
Mr. W. C. Tallman 50-444 Chairman and Chief Executive Officer 1000 Elm Street Manchester, New Hampshire 03105 l
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_SSINS No.:
68-35 Accession No.:
8107230037 IEC 81-14 UNITED STATES MUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 November 5, 1981 l
IE CIRCULAR NO. 81-14: MAIN STEAM ISOLATION VALVE FAILURES TO CLOSE Description m.
Circumstances:
Sased on data available in Licensee Event Report (LER) files, the failure rate of main steam isolation valves (MSIVs) closing has ranged from a ten year low of three to fourteen in 1980.
Recent failures, similar to those occurring over the last ten years, are primarily related to the following two causes:.(1) poor.
quality control air to the pilot valves and (2) binding of the MSIV valve stems with the valve stem packing.
(Refer to IE-Information Notice 80-16 for additional details.) These two failure modes contributed to about 85% of the MSIV failure to close events.
Both.causes also represent common-mode failure mechanisms of which two examples occurred in 1980:
(1) two valves failed to close at Nine Mile Point Unit 1 because of rust in the pilot solenoid valves, 4
and (2) three valves failed to close at Trofan Unit 1 because of stem binding.
I These two failure modes are significant in snat; (1) they identify mechanisms by which more than one MSIV may fail to close at the same time thus leading to condit' ions which have not been considered ta the plant's safety analyses,* and (2) they are continuing to occur even though corrective actions reported in the LERs indicate that the technology is available to prevent such failures.
It was noted that more than half of the current operat'ng reactor units have not reported any failure of an MSIV to close in ten years, whereas the 28 reporting units experienced at least 90 failures (from all causes).
This indicates that major differences may exist in MSIV reliability and in the quality of support systems and operational controls that affect the MSIV f
reliability.
Data from the LER files is attached to show trends, recent history, and detailed data shcwing licensee experience:
6 Table 1 - MSIV Failures To Close per Year, shows the ten year history-of all reported failures by three categories: solenoid or pilot valve related, stem binding, and other.
The first two categories account for 92% of the failures.
(The 85% for the two causes stated in the first paragraph of this circular was obtained by disregarding what appeared to be truly isolated solenoid or solenoid installation failures not related to control fluid quality.)
" Note:
The potential for poor quality air leading to multiple valve control failures in other safety-related systems is currently under evaluation by NRC.
r IEC 81-14 N3vember 5, 1981 Page 2 of 2 Table 2 - MSIV Failures To Close, by Plant, for 1979-and 1980, shows failure experiences by plant for the last two years.
Table 3 - LER Data, by Plant, on "iIV Failures To Close (1970-1980), is an extraction of all the LER data from 1970 to 1980 that snow details of each plants experience.
Tables 1 and 2 were developed from data in this table.
Recommend 2d Actions for Holders of Operating Licenses:
1.
Review MSIV operating experiance for problems that are causing failure to close events or are causing equipment degradation that requires other than routine maintenance to prevent a failure to close.
2.
Evaluate corrective action identified in maintenance records, LERs, etc.,
for adequacy in addressing the root cause of problems and develop plans for additional corrective action as necessary.
3.
Where control air quality is suspected of contributing to problems:
a.
Review the air system (s) to ensure that measures have or will be taken to prevent air quality degradation in the future.
b.
Consider monitoring and/or alarms (such as dew point alarms) to warn of air quality degradation.
4.
When stem binding is contributing to problems, maintenance procedures should be reviewed to ensure that they:
a.
Include precautions against detrimentai affects such as over tightening packing glands or using inappropriate lubricants.
l b.
Require tests to demonstrate that the valves will perform under operating conditions before being placed in service.
I Reccmmended Action for Holders of Construction Permits:
1.
Evaluate MSIV control air system designs in light of both succr.ssful and unsuccessful industry experience.
2.
Consider design changes where aopropriate to ensure high reliability and to minimize or eliminate the common-mode failure poten'.ial present in current designs.
No written response to this circular is required.
If you desire additional information regarding these matters, please contact the Director of the appropriate NRC Regional Office.
Attachments:
v--
1.
Tables I, II, III 2.
Recently issued IE Circulars
Attachmint 1 TABLE 1 Pilot Valve Stem i
Year Related Binding Other Total 1970 9
9 71 2
1 3
i 72 3
3 73 1
1 1
3 74 8 (7) 8 (7) 75 5 (1) 1 6 (1) 76 4 (1) 3 2
9 (1) 77 4 (1) 1 5 (1) 78 5.
2 7
79 3 (4) 5 1
9 (4) i 80 7
6 1
14 Ten-Year Total 65 (14) 18 7
90 (14)
Sites reporting failures:
22 Reactor units involved:
28 Numbers in parentheses represent failures listed in the LERs as previous occurrences but not fcund reported in other LERs in the file TABLE 2 Pilot Valve Stem Year Related Bind'ng Other Total 1979 Point Beach 2 3
3 Quad Cities 1 1
1 Trojan 1 2
2 Vermont Yankee 1
1 Zion 1 1
1 Zion 2 1
1 Total 3
5 1
9 1980 E. I. Hatch 2 1
1 Nine Mile Point 1 2
2 Quad Cities 1 3
3 Trojan 1 4
4 Eig Rock Point 1
1 Monticello 1
1 North Anna 1 1
1 Point Beach 2 1
1 Total 7
6 1
14
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Tablo 3 r
Lfft DAT A, PLANT, ON HSIV FAILuitLS 10 clost ( 1910-1980) i Numtier of Nature of Plant failuros failurus DiaLL 1'1 Lyn!?LIMio
!!!nin L2-h"_)
11121o '>a l MarlufAElure r Heave r Va l l ey 1 09-19-76 I
c Unknown Schutte & Koerting Co.
hig Itock Point 09-06-78 1
b Packing / binding stem Wm. Powoli Co.
03-03-73 1
b Packing /bi.. Jing stem Wm. Powell Co.
11-01-80 1
b Packing / binding stum Wm. Powell Co.
07-11-73 1
c Unknown Not listed Dresden 1 4
Dresden 2 01-22-71 1
a Air pilot valvo/rosiduo Not listed 05-021-70 is a
Pi lot va lvo/clea ranco Not listed 12-01s-70 34 a
Pilot valvo/tlein film Not listed 08-11-75 1
a Pilot solenoid / stuck At. wood & Morrill Co.
L.
1.
Ila tc h 1 8
5 06-IS-75 1( +1 )a Solenoid /deliris buildup Automatic Valve Corp, 4
88 3I112 01-07-75 3
a So l eno ld/opo ra t ed improperly /
Modol 44" j
air filtors cleaned
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1.
Ilatch 2 05-21-fl0 t
a Solenoid / faulty o-ring ASCO
- 11. II. Itobinson 2 12-17-78 1
b Packing gland / misadjusted Schutto & Koorting Co.
lladdam Neck 1 01-2?-76 1
a Solenoid Valve / frozen moisturo Schutto & Koerting Co.
l 09-16-77 I
b Packing gland /too tight indian Point 3 12-17-76 2
b Pacieng gland / shaft binding Atwood & Morrill Co.
i La Crosso iMit 07-02-71 1
.5 Pilot valvo/rusiduo buildup Not listed i
~^*Sco footnotes on last page of table.
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TADLE 3 (continued)
Number of Natu n of Plant ra i f u ros l'a l l ur en Ih9Lo 1*l f.Y!111Llhllo
(!{G.LHL2. t".)
( Hgl H_S
- l.. _.,
Hamif191gre r 8
Hillstono 1 11-19-70 1
a Sildo valvo/ sailed to vont uir Not listed 11-0i-78 1(+3ja Pilot vaIvo/ crud leuifdup Numatics 4
11-15-784 1
a Air slido valvo/rotoign Humatics material Monticello 1 02-16-784 2
a dolonoid Valvos/motal shavings Automatic Valve Corp.
Ols-17-80 1
a in air mani f old/Solenold/part-iculato in solonoid plunger Atwood & Morrill Co., loc.
Nino Milo Point 1 03-03-80 2
a Pilot valvo6/ rust buildup Humatics North Anna 1 01-10-fl0 1
c Auxilia ry rolay/open Westinghouse 1:lectric Corp.
08-23-77 1
a.
Solonoid valvos/dorormed gaskot Not listed Oyster Croek 1 4
01-16-ils 1
a Pilot valvo/residuo Humatics 12-29-72 1
a Pilot valvo/rino dust Not listed 11-16-71 1
c Dashpot piston /irori cushion spud ralluro Not listed Peach Bottom 2 11-18-16 1
b Isaci, scat /gougisig stem Atwood & Morrill Co.
Peach tiottom 3 01-02-76 1
a Solonoid valvo/soat damaged Allied Control Co.
01-22-77 I
a Solenoid valvo/ winding ralluro Automatic Valve Corp.
Pilgrim i 11-16-73 1
a Activator /small foreign particlo Not listed 11-29-72 1
a Pilot valve / stuck Hot listed 07-25-776 1
a Spool picco/ containment build-up (air system)
Not listed Point Beach 2 02-19-79 2
b Valvo Shart/ binding Atwood & Morrill Co.
02-29-79 I
b Packing / binding sha f t 09-12-150 1
b Packing / binding shart
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IE Circular 81-14 November 5, 1981 RECENTLY ISSUED IE CIRCULARS Circular Date of No.
Subject Issue Issued to 81-13 Torque Switch Electrical 9/25/81 All holders of a Bypass Circuit For Safe-power reactor guard Service Valve Maters 10L or CP 81-12 Inadequate Periodic Test 7/22/81 All power reactor Procedure of PWR Protection facilities with an System OL or CP 81-11 Inadequate Decay Heat 7/23/81 All holders of Removal a power reactor OL or CP 81-10 Steam Voiding in the 7/2/81 All holders of Reactor Coolant System PWR reactor During Decay Heat OL or CP Removal Cooldown 81-09 Containment Effluent 7/10/81 All pewer reactor Water Thr.t Bypasses facilities and and Radioactiv ty Monitor OL 81-08 Foundation Materials 5/29/81 ^
All holders of a power reactor OL or CP 81-07 Control of Radioactively 5/14/81 All holders of Contaminated Material a power reactor OL or CP 81-06 Potential Deficiency 4/14/81 All holders of a Affecting Certain Foxboro power reactor 10 to 50 M1111 ampere OL or CP Transmitters 81-05 Self Aligning Rod 3/3/81 All holders of a End Bushings for Pipe rower reac Supperts OL or CP 81-04 The Role of Shift Technical 4/30/8?
All holders of Advisors and Importance of a power reactor Reporting Operational Events OL 81-03 Inoperable Seismic 3/2/8i All holders of a Monitoring Instruments power reactor OL or CP