ML20112F920
| ML20112F920 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/06/1984 |
| From: | Foster D GEORGIA POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-84, REF-PT21-85-060-000 GN-491, PT21-85-060-000, PT21-85-60, NUDOCS 8501160096 | |
| Download: ML20112F920 (7) | |
Text
Georg'a Power Cortpany Route 2. Box 299A Waynesboro. Georgia 30830 Teiephone 404 554-9961. Ext. 3360
~ 04 724-8114. Est 3360 4
M 0EC II
'o I : 2g Georgia Power o.o.rosi.,
Vice Presdeni and Project General Manager tre sourNrn eieruc sysn m Vogt!e Project December 6, 1984 United States Nuclear Regulatory Commission Office of Inspection and Enforcement File:
X78G03-M70 Region II - Suite 2900 Log:
GN-491 101 Marietta Street, Northwest Atlanta, Georgia 30323
Reference:
Vogtle Electric Generating Plant-Units 1 and 2; 50-424, 50-425; Bettis Damper and Yalve Actuators Attention: Mr. James P. O'Reilly Enclosed is a copy of our evaluation for the above referenced subject.
Our evaluation has concluded that a reportable condition could exist per the reporting criteria of 10 CFR 50.55 (e).
It should be also tm noted that GH-Bettis has already generically informed the NRC of the existence of this concern in their 10 CFR 21 report of November 18, 1983.
This response contains no proprietary information and may be placed in the NRC Public Document Room.
Your truly
/%
D. O. Fost r REF/DOF/tdm xc:
U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C.
20555 R. J. Kelly J.' A. Bailey G. Bockhold R. E. Conway O. Batum P. D. Rice G. F. Head H. H. Gregory C. S. McCall (OPC)
J. T. Beckham W. T. Nickerson E. L. Blake, Jr.
R. A. Thomas D. R. Altman (Shaw, et al.)
D. E. Dutton D. L. Kinnsch (BPC)
J. E. Joiner W. F. Sanders (NRC)
J. L. Vota (W)
(Troutman, et. al.)
- 9. H. Pinson L. T. Gucwa D. C. Teper (GANE)
B. M. Guthrie C. E. Belflower L. Fowler (LEF E. D. Groover M. Malcom (BPC)
T. Johnson (egh]CIAI. Copy 8501160096 841206
((( g-PDR ADOCK 05000424 S
ppg
EVALUATION FOR A REPORTABLE CONDITION Initial Report:
On November 6, 1984, Mr.
R.
E. Folker, Georgia Power Company, Vogtle Project Quality Assurance Engineer, contacted Mr. W. H. Rankin, USNRC, Region II, concerning an initial evaluation of G. H. Bettis Actuators.
During this initial contact Mr. Folker stated that the failure of these actuators to stroke within the required 15 second interval was poten-tially repcrtable under regulatory requirements.
Background Information:
G. H. Bettis issued a Part 10 CFR 21 report on November 18, 1983.
This report was based on laboratory testing of a series of nuclear-qualified actuators.
The results of these tests indicated that there existed a potential to have actuators encounter a degradation of stroking time related to elapsed time from original manufacture, i
The reason for the potential degradation of actuator perfomance was traced to the specific combination of seals and grease used in the original actuator.
Ethylene propylene seals were observed to swell because hydrocarbons were absorbed from the lubricating grease.
Seal swell increased the time required to initialize stroke.
The seal material and grease were identical to those tested in G.
H.
Bettis qualification report 37274 which has been submitted to and approved by all nuclear customers of G.
H.
Bettis.
Bettis identified the following actuators as having the potential of stroking speeds greater than 15 seconds:
NCB series, N52X series, N72X series N73X series, NT310-SR4, NT310-SRS, and NT312-SR5.
Bettis used a 15-second stroking time as representative of customer specifications submitted for safety-related pneumatic valve operators.
In summary, G. H. Bettis reported that ethylene propylene rubber seals in contact with the factory-applied hydrocarbon-based lubricant are subject to swelling.
In addition, the seals will " set" (i.e., flatten at the contact surface) against the sealing surfaces if the actuators are not exercised frequently.
The problem is that the ethylene-propylene actuator seals swell when placed in contact with the Mobil 28 grease used in the manufacture of "N"-series actuators.
On the Vogtle Project G. H. Bettis is a subvendor to Johnson Controls,
'Inc. (JCI) for pneumatic-operated HVAC dampers and to Fisher Controls for ' containment minipurge isolation valves and boron recycle holdup
-tank isolation valves.
Engineering Evaluation:
The rotary valve actuators operate various valve and damper assemblies which must open or close in response to safety signals generated as the result of a design basis accident.
The actuator causes the respec-tive valve or damper to move to the closed or open position, usually
Page Two within a specified time period, to isolate or vent various mechanical and HVAC systems.
Attachments A, B, and C list the various dampers and valves potentially affected by this reaction.
Their location, ESF system, size, and safety function are also provided.
G. H. Bettis, in their 10 CFR 21 report, lists by number those rotary valve actuator models which had potential stroking times of greater than 15 seconds.
There are a total of 98 dampers and 4 valves supplied with G.
H.
Bettis actuators used in safety-related applications at VEGP.
Of this total population, there are 70 dampers and 4 valves which may affect plant safety if their actuator's stroke time degrades and exceeds their specified stroke time.
This condition represents a deviation from the performance specifications for these components.
Attachment A identifies the GH-Bettis actuators that are required to close in less than 15 seconds that are susceptible to this concern.
The actuators in Attachment B are required to close in the time interval of 15 to 30 seconds.
With the information currently available from the prime vendors, it cannot be determined if the stroke time would degrade beyond 30 seconds.
In order to assure system operability, Georgia Power Company will obtain and analyze vendor test information to detennine if these actuators are acceptable for use.
Attachment C identifies dampers with Bettis actuator models not identi-fled in their previous report filed with the NRC.
These actuators are susceptible to this problem since the seal material and lubricant are the same as the suspect actuators identified by Bettis to the NRC.
In this case, these actuators are required to stroke in less than 15 seconds.
==
Conclusion:==
Georgia Power Company has concluded that this condition is reportable per the criteria of Part 10 CFR 50.55 (e).
This condition has already been reported to the NRC per the criteria of Part 10 CFR 21.
Corrective Action:
All actuators in Attachments A and C will be serviced with new seals and Dow Corning Molykote 44 lubricant prior to fuel load.
Actuators in Attachment B will also be reconditioned unless vendor test information indicates that the actuators will close within the required time interval.
i ATTACHMENT A l
SAFETY-RELATED ISOLATION DAMPERS 6-SECGID SPECIFIED STROKING TIME WITH ACTUATOR MODELS LISTED IN GH-BETTIS' 10CFR21 REPORT 9
BLOG.
SYSTEM SIZE l
TAG NO.
N0.
REMARIG A HV 12479 FM 1542 52/40 Fuel Handling Building Isolation A HV 12480 FHB 1542 52/40 Fuel Handling Building Isolation.
4 A' HV 12481 FHB 1542 48 /48 Fuel Handling Building Isolation A HV 12482 Fle 1542 48/48 Fuel Handling Building Isolation 1 HV 12604 AB 1 561 34/34 Piping Penetration Area Isolation 2 HV 12604 AB 1 561 34/34 Piping Penetration Area Isolation 1 HV 12605 A8 1 561 40/26 Piping Penetration Area Isolation 2 HV 12605 A8 1 561 40/26 Piping Penetration Area Isolation 1 HV 12606 A8 1 561 40 /26 Piping Penetration Area Isolation 2 HY 12606 AB 1561 40/26 Piping Penetration Ares ! solation l
1 HV 12607 AB 1 561 34/34 Piping Penetration Area Isolation 2 HV 12607 A8 1 561 34 /34 Piping Penetration Area Isolation
~
D e
ATTAC MENT B SAFETY-RELATED OR SEISMIC CATEGORY 1 VALVES AND DAMFERS j
SPECIFIED STROKING TIME >15 SECONOS AND ACTUATOR 20ELS LISTED IN GH-BETTIS' 10CFR21 REPORT SLDG.
SYSTEM SIZE.
TAG N0.
NO.
REMARKS 2
1 HV 12713A C8 1532 10/10 Halon Isolation - Remote, Shutdown Panel 2 JV 12713A CB 1532 10/10 Halon Isolation - Remote Shutdown Panel 1 HV 127138 C8 1532 10/10 Halon Isolation - Remote Shutdown Panel 4
2HV 127138 C8 1532 10/10 Halon Isolation - Remote Shutdown Panel 1 HV 12716 C8 1532 36/24 Smoke Exhaust 2 HV 12716 C8 1532 36/24 Smoke Exhaust 1 HV 127-19 C8 1532 36/16 OSA For Smoke Exhaust 2 HV 12719 C8 1532 38/24 OSA For Smoke Exhaust 1 HV 12721 C8 1532 32/48 Recirculation Shutoff for smoke Exhaust 2 HV 12721 C8 1532 32/48 Recirculation Shutoff for Smolte Exhaust i
l 1 HV 12731 C8 1532 36/24 Smoke Exhaust 2 HV 127'31 C8 1532 36/24 Smoke Exhaust i
f 1 HV 12734 C8 1532 36/16 OSA For Smoke Exhaust 2 HV 12734 C8 1532 38/24 OSA For Smoke Exhaust 1 HV 12736 C8 1532 32/48 Recirculation Shutoff for Smoke Exhaust 2 HV 12736 CB 1532 32/48 Recirculation Shutoff for Smoke Exhaust 1 HV 12753A C8 1532 10/10 Halon Isolation - Remote Shutdown Panel 2 HV 12753A C8 1532 10/10 Halon Isolation - Remote Shutdown Panel 1 HV 127538 C8 1532 10/10 Halon Isolation - Remote Shutdown Panel 2 HV 127538 CB 1532 10/10 Halon Isolation - Remote Shutdown Panel A PDV 12168A C8 1 531 76/38 OSA For Smoke Exhaust. CR A PDV 121688 C8 1 531 96/36 Recirculation Shutoff for Smoke Exhaust A POV 12168C C8 1 531 72/36 CR Smoke Exhaust
Attachment B (Continued)
Page 2 of 2 BLDG.
SYSTEM.
SIZE TAG NO.
No.
REMARKS A PDV 121680 CB 1531 96/36 Recirc. Shutoff for CR Smoke Exhaust A HV 12799A CB 1531 12/12 Halon Isolation, Records A HV 127998 CB 1531 14/14 Halon Isolation, Records 1 HV 12596 AB 1210 10" Boron Recycle Holdup Tank Vent Valve 2 HV 12596 AB 1210 10" Boron Recycle Holdup Tank Vent Valve 1 HV 12597 AB 1210 10" Boron Recycle Holdup Tank Vent Valve 2 HV 12597 AB 1210 10" Boron Re~ cycle Holdup Tank Vent Valve e
e e
ATTACHMENT C o
SAFETY-RELATED ISOLATION DAMPERS-6 SECOND OR LESS SPECIFIED STROKING i
TIME WITH ACTUATOR EDELS' NOT IN GH-8ETTIS10CFR21 REPORT BLDG.
SYSTEM SIZE TAG NO.
N0.
REMARKS 1 HV 26268 C8 1505 14" Mini-Purge Supply CTB Isolation
- 2 HV 26268 C8 1505 14" Mint-Purge S@ ply CTB Isolation
- 1 HV 26278 CB 1505 14" Mini-Purge S@ ply CTB Isolation
- i 2 HV 26278 C8 1505 14" Mint-Purge Supply CT8 Isolation
- 1 HV 26288 CB 1506 14" Mint-Purge Supply CT8 Isolation
- CB 1506 14" Mfnt-Purge Supply CTB Isolation
- 2 HV 26288 j
1 HV 26298 C8 1506 14" Mint-Purge S@ ply CT8 Isolation
- I 2 HV 262g8 CB 1 506 14" Mini-Purge Supply CT8 Isolation *
'A HV 2528 C8 1 541 36" Fuel Handling Building Isolation A HV 2529 CB 1 541 36" Fuel Handling Building Isolation A HV 2534 2
1 541 36" Fuel Handling Building Isolation l
A HV 2535 C8 5541 36" Fuel Handling Building Isolation 1 HV 12146 CB 1 531 42" Control Room Isolation 2 HV 12146 C8 1531 42" Control Room Isolation 1 HV 12147 C8 1 531 42" Control Room Isolation 2 HV 12147 C8 T531 42" Control Room Isolation 1 HV 12148 C8 1531 42" Control Room Isolation 2 HV 12148 C8 1531 42" Control Room Isolation 1 HV 12149 CB 1 531 42" Control Room Isolation 2 HV 12149 C8 1531 42" Control Room Isolation A HV 12152 C8 1 531 20" Control Room Isolation A HV 11153 C8 1 531 20 "
Control Room Isolation A HV 12162 C8 1531 18" Control Room Isolation-A HV 12163 C8 1 531 18" Control Room Isolation 1 HV 2636A C8 -
1562 24" Electrical Penetration Area Isolation 2 HV 2636A C8 1562 24" Electrical Penetration Area Isolation 1 HV 26368 C8 1562 24" Electrical Penetration Area Isolation 2 HV 26368 CB 1562 24" Electrical Penetration Area Isolation 1 HV 2638A CB 1562 24" Electrical Penetration Area Isolation l'
2 HV 2638A C8 1562 24" Electrical Fenetration Area Isolation 1 HV 26368 C8 1562 24" Electrical Penetration Area Isolation 2 HV 26368 C8 1562 24" Electrical Penetration Area Isolation
- Note: Specified stroking time for mini-purge isolation is 5 seconds or less.
i