ML20032C472
| ML20032C472 | |
| Person / Time | |
|---|---|
| Site: | Monticello, Dresden, Davis Besse, Palisades, Perry, Fermi, Kewaunee, Point Beach, Byron, Braidwood, Prairie Island, Callaway, Duane Arnold, Clinton, Cook, Quad Cities, La Crosse, Big Rock Point, Zion, Midland, LaSalle, Zimmer, Bailly, Marble Hill  |
| Issue date: | 11/05/1981 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEC-81-14, NUDOCS 8111100455 | |
| Download: ML20032C472 (1) | |
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W 56 American Electric P(wer Service Corporation D. C. Cook 1, 2 (50-MS, 50-316)
Cincinnati Gas and Electric Company Zimmer (50-358)
The Cleveland Electric Illuminating Company Perry 1, 2 (50-440, 50-441)
Commonwealth Edison Company Braidwood 1, 2 (50-456, 50-457)
Byron 1, 2 (50-454, 50-455)
Dresden 1, 2, 3 (50-10, 50-237, 50-249)
La Salle 1, 2 (50-373, 50-374)
'D Quad-Cities 1, 2 (50-254, 50-265) s Zion 1, 2 (50-295, 50-304)
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Consumers Power Company C
YOS[gg7h [9 Big Rock Point (50-155) s.4,,oa,,
Palisades (50-255)
Midland 1, 2 (50-329, 50-330) 3-
%5tcu Dairyland Power Corporation N
3 9
LACBWR (50-409)
The Detroit Edison Company Fermi 2 (50-341)
Illinois Power Company Clinton 1, 2 (50-461, 50-462)
Iowa Electric Light and Power Company Duane Arnold (50-331)
Northern Indiana Public Service Company Bailly (50-367)
Northern States Power Company Monticello (50-263)
Prairie Island 1, 2 (50-282, 50-306)
Public Service of Indiana j
Marble Hill 1, 2 (50-546, 50-547)
Toledo Edison Company 1
Davis-Besse 1 (50-346) l Union Electric Company Callaway 1, 2 (40-483, 50-486) 4 Wisconsin Electric Power Company Point Beach 1, 2 (50-266, 50-301)
Wisconsin Public Service Corporation 8111100055 811105 Kewaunee (50-305)
PDR ADOCK 05000010 0
PDR Illinois Department of Nuclear Safety Gary N. Wright, Manager, Nuclea.- Facility Safety
$6NSulq
SSINS No.:
6835 Accession No.:
8107230037 IEC 81-14 UNITED STATES NUCLEAR REGULATORY COMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 November 5, 1981 IE CIRCULAR NO. 81-14:
MAIN STEAM ISOLATION VALVE FAILURES TO CLOSE Description of Circumstances:
Based 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 thrce 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 values failed to close at Nine Mile Point Unit 1 because of rust in the pilot solenoid valves, and (2) three valves failed to close at Trojan Unit 1 because of stem binding.
These two failure modes are significant in that; (1) they identify mechanisms by which more than one MSIV may fail to close at the same time thus leading to conditions which have not been considered in 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 operating 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 reliability.
Data frok the LER files is attached to show trends, recent history, and detailed data showing licensee experience:
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 bi' ding, and other.
The first two categories account for 92% of the failures.
(Thi 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.
O
IEC 81-14 November 5, 1981 Page 2 of 2 Table 2 - MSIV Failures To Close, by Plant, fcr 1979 and 1980, shows failure experiences by plant for the last two years.
Table 3 - LER Oata, by Plant, on MSIV Failures To Close (1970-1980), is an extraction 7of all the LER data from 1970 to 1980 that show details of each plants experience.
Tables 1 and 2 were developed from data in this table.
4 Recommended Actions for Holders of Operating Licenses:
1.
Review MSIV operating experience 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 l
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 problams, maintenance procedures should be reviewed to ensure that they:
a.
Include precautions against detrimental affects such as over tightening packing glands or using inappropriate lubricants.
b.
Require tests to demonstrate that the valves will perform under operating conditions before being placed in service.
d Recommended Action for Holders of Construction Permits:
1.
Evaluate MSIV control air system designs in light of both successful and unsuccessful industry experience.
2.
Consider design changes where appropriate to ensure high reliability and to minimize or eliminate the common-mode failure potentia) present in current i
designs.
4 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.
i Attachments:
1.
Tables I, II, III i
2.
Recently issued IE Circulars
Attachm:nt 1 TABLE 1 e'
Pilot Valve Stem Year Related Binding Other Total 1970 9
9 71 2
1
-3 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
i 79 3 (4) 5 1
9 (4) 80 7
6 1
14 Ten-Year Total 65 (14) 18 7
90 (14) i Sites reporting failures:
22 Reactor units involved:
28 Numbers in parentheses represent failures listed in the LERs as previous occurrences but not found reported in other LERs in the file.
TABLE 2 Pilot Valve Stem Year Related Binding 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 i
Nine Mile Point 1 2
~
2 Quad Cities 1 3
3 Trojan 1 4
4 Big Rock Point 1
1 Monticello 1
1 I
North Anna 1 1
1 Point Beach 2 1
1 Total 7
6 1
14
I of 4 Table 3 LER DATA, PLANT, ON MSIV FAILURES TO CLOSE (1970-1980)
Number of Nature of Plant Failures Failures (Note 1*)
Event Date (Notes 2-4*)
(Note 5*)
Manufacturer Beaver Valley 1 09-19-76 1
c Unknown Schutte & Koerting Co.
Big Rock Point 09-06-78 1
b Packing / binding stem Wm. Powell Co.
03-03-73 1
b Packing / binding stem Wm. Powell Co.
11-01-80 1
b Packing / binding stem W. Powell Co.
m Dresden 1 04-11-73 1
c Unknown Not listed Dresden 2 01-22-71 1
a Air pilot valve / residue Not listed 05-08-70 4
a Pilot valve / clearance Not listed 12-04-70 4
a Pilot valve / thin film Not listed E. I. Hatch 1 04-17-75 1
a Pilot solenoid / stuck Atwood & Morrill Co.
06-15-75 1(+1)a Solenoid / debris buildup Automatic Valve Corp, l
07-07-75 3
a Solenoid / operated improperly /
Model 443B12 air filters cleaned E. I. Hatch 2 05-21-80 1
a Solenoid / faulty o-ring ASCO H. B. Rcbinson 2 12-17-78 1
'b Packing gland / misadjusted Schutte & Koerting Co.
Haddam Neci 1 01-22-76 1
a Solenoid Valve / frozen moisture Schutt e & Koerting Co.
09-16-77 1
b Packing gland /too tight Indian Point 3 12-17-76 2
b Packing gland / shaft binding Atwood & Morrill Co.
La Crosse BWR 07-02-71 1
a Pilot valve / residue buildup Not listed
- See footnotes on last page of table.
2 of 4 TABLE 3 (continued)
Number of Nature of Plant Failures Failures (Note 1*)
Event Date (Notes 2-4*)
(Note 5*)
Manufacturer Millstone 1 19-70 1
a slide valve / failed to vent air Not listed 11-04-74 1(+3)a Pilot valve / crud buildup Numatics 11-15-74 1
a Air slide valve / foreign Numatics material Monticello 1 02-16-74 2
a Solenoid Valves / metal shavings Automatic Valve Corp.
08-17-80 1
a in air manifold / Solenoid /part-ieulate in solenoid plunger Atwood & Morrill Co.,Inc.
Nine Mile Point 1 03-03-80 2
a Pilot valves / rust buildup Numatics North Anna 1 01-10-80 1
c Auxiliary relay /open Westinghouse Electric Corp.
Oyster Creek 1 04-23-77 1
a Solenoid valves / deformed gasket Not listed 01-16-74 1
a Pilot valve / residue Numatics 12-29-72 1
a Pilot valve / fine dust Not listed 11-16-71 1
c Dashpot piston / iron cushian spad failure Not listed Peach Bottom 2 11-18-76 1
b Backseat / gouging stem Atwood & Morrill Co.
Peach Bottom 3 01-02-76 1
a Solenoid valve / seat damaged Allied Control Co.
07-22 I a
Solenoid valve / winding failure Automatic Valve Corp.
Pilgrim 1 11-16-73 1
a Activator /small foreign particle Not listed 11-29-72 1
a Pilot valve / stuck Not listed 07-25-74 1
a Spool piece / containment build-up (air system)
Not listed Point Beach 2 02-19-79 2
b Valve Shaft / binding Atwood & Morrill Co.
02-29-79 1
b Packing / binding shaft 09-12-80 1
b Packing / binding shaft
4 3 of 4 TABLE 3 (continued) l Number of Nature of Plant Failures Failures j
(Note 1*)
Event Date (Notes 2-4*)
(Note 5*)
Manufacturer i
Quad Cities 1-09-14-79 1
a Pilot valve / sticking Automatic Valve Co.
02-24-80 1
a Pilot valve / blockage 06-21-80 2
a Pilot valve / exhaust restrictor 11-15-72 1
a Pilot valve / dirt fm instrument Not listed air Quad Cities 2 03-19-76 1
a Pilot assembly / foreign material Automatic Valve Co.
09-22-77 1
a Pilot valve / damaged o-ring Automatic Valve Co.
Surry 2 02-04-76 1
c Disc / binding against body Schutte & Koerting Co.
Trojan 1 02-21-78 1
a Solenoid valve / rust accumulation Not listed 04-14-79 2
b Packing / binding Atwood & Morrill 04-11-80 3
b Packing / binding Atwood & Morrill 10-03-80 1
b Component failure (binding of stem?)
Atwood & Morrill Turkey Point 3 10-26-75 1
c Unknown Schutte & Koerting l
Vermont Yankee 1 02-04-78 1
a Pilot valve / foreign particle Rockwell Mfg.
12-09-77 1(+1)a Pneumatic spool / foreign particle Rockwell Mfg.
i 04-03-79 1
c Spring / binding on guide shaft Rockwell International 01-24-74 1
a Pilot valve / sticking Not listed l
09-15-74 1(+4)a Pilot valve / failed to actuate Numatics Zion 1 05-06-78 1
a 4-way directional control valve /
Rexroth 05-23-79 1(+4)a jammed hydraulic /DC solenoid /
l stuck / hydraulic Teledyne
4 of 4 TABLE 3 (continued) 4 Number of Nature of Plant Failures Failures (Note 1*)
Event Date (Notes 2 **)
(Note 5*)
Manufacturer Zion 2 06-03-76 1(+1)a DC solenoid / corrosion / hydraulic Teledyne 10-15-78 1
a Solenoid valves / Failed to operate 02-05-78 1
a Solenoid valves failed to operate 02-09-79 1
a Solenoid valves / failure to operate /
hydraulic Notes:
- 1) All data are extracted from the LER file.
- 2) Numbers in parentheses represent "other related failures" mentioned by the LER but not the subject of another LER in the file.
- 3) Numbers greater than one represent several failures being reported by the same LER which frequently, but not necessarily, represent simultaneous failures.
- 4) The lette "a" represents an input to Table I under " Pilot Valve Related" problems, "b" represents Stem Binding, and "c" represents "Other" on the table.
- 5) Some liberty was taken in interpreting the cause of failure where clear descriptions were not available.
IEC 81-14 November 5, 1981 RECENTLY ISSUED IE CIRCULARS Circular Date of No.
Subject Issue Issued to 81-13 Torque Switch Electrical Bypass 9/25/81 All power reactor Circuit for Safeguards Service facilities with an Valve Motors OL or CP 81-12 Inadequate Periodic Test Proce-7/22/81 All power reactor dure in PWR Protection System facilities with an OL or'CP 81-11 Inadequate Decay Heat Removal 7/23/81 All BWR facilities with OL or CP 81-10 Steam Voiding in the Reactor 7/2/81 All power reactor Coolant System During Decay facilities with an Heat Removal Cooldown OL or CP 81-08 Foundation Materials 5/29/81 All power reactor facilities with an OL or CP 81-07 Control of Radioactively 5/14/81 All power reactor Contaminated Material facilities with an OL or CP 81-06 Potential Deficiency Affecting 4/14/81 All power reactor Certain Foxboro 20 to 50 facilities with an Milliampere Transmitters OL or CP 81-05 Self-Aligning Rod End Bushings 3/31/81 All power reactor for Pipe Supports facilities with an OL or CP 81-04 The Role of Shift Technical 4/30/81 All power reactor Advisors and Importance of facilities with an Reporting Operational Events OL or near-term 0L S1-03 Inoperable Seismic Monitoring 3/2/81 All power reactor Instrumentation facilities with an OL or CP 81-02 Performance of NRC-Licensed 2/9/81 All power reactor Individuals While on Outy facilities (research
& test) with an OL or CP OL = Operating License CP = Construction Permit