ML20206B320
| ML20206B320 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 06/02/1986 |
| From: | Van Brunt E, Vanbrunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Kirsch D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| REF-PT21-86, REF-PT21-86-231-000 ANPP-36725-EEVB, DER-86-11, PT21-86-231, PT21-86-231-000, NUDOCS 8606190067 | |
| Download: ML20206B320 (6) | |
Text
!!ECDVE0 in?C Arizona Nuclear Power Project ig. 3,I -5 /
3 P o. BOX $2034 e PHOENIX, ARIZONA 85072-2034 0<e June 2,1986 g en.,,,,, U,
ANPP-36725-EEVB/IR7DiiL 92.11 U. S. Nuclear Regulatory Commission Region V 1450 Maria Lane - Suite 210 Walnut Creek, California 94596-5368 Attention:
Mr. D. F. Kirsch, Acting Director Division of Reactor Safety and Projects Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2, 3 Docket Nos. 50/528, 529, 530
Subject:
Final Report - DER 86-11 A 50.55(e) and 10CFR21 Condition Relating to Skinner Solenoid Valves File: 86-006-216; D.4.33.2
Reference:
(A) Telephone Conversation between R. C. Sorenson and D. R. Larkin on March 14, 1986 (Initial Reportability - DER 86-11)
(B) ANPP-36087, dated April 14, 1986 (Interim Report - DER 86-11)
(C) ANPP-36519, dated May 7, 1986 (Time Extension - DER 86-11)
Dear Sir:
Attached, is our final written report of the Deficiency under 10CFR50.55(e) referenced above. The 10CFR21 Evaluation is also included.
Very truly yours, OLW q
E. E. Van Brunt, Jr.
Executive Vice President Project Director EEVBJr/DRLikp Attachments cc: See Page Two i
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ZE.17
DER 86 Final Report Mr. D. F. Kirsch
- Acting Director Page Two cc J. M. Taylor, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 4
Washington, D. C.
20555 A. C. Gehr (4141)
R. P. Zimmerman (6295)
Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway - Suite 1500 Atlanta, Georgia 30339 Y
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.,s FINAL REPORT - DER 86-11 a
DEFICIENCY EVALUATION 50.55(e)
ARIZONA NUCLEAR POWER PROJECT (ANPP)
PVNGS UNITS 1, 2, 3 I.
Descripilon of Deficiency During a recent review to reestablish 1E qualification documentation for all devices attached to the 125 Vdc power supply, it was discovered that the Skinner solenoid valves were qualified based on being normally deenergized rather than energized as required by their use in the Main Steam Isolation Valves (MSIV's) and Main Feedwater Isolation Valves (MFIV's). These valves, supplied by the Anchor Darling Valve Company (ADVC), have hydraulic actuators controlled by electrically actuated Skinner solenoid valves (Model No. V5H65600). During normal operation of the main steam and main feedwater systems, these normally energized solenoid valves maintain the MSIV's and MFIV's in the open position.
ADVC's reanalysis of the energized condition established an unacceptable short life time for the solenoids.
Evaluation The Skinner solenoid valves are Class 1E components and are listed on the attachment. Per IEEE 323-1974, all Class 1E equipment must have proper documentation for the qualified life. The valves and accessories shall have a design life of not less than 40 years at specified conditions, exclusive of expendable material, per Specification 13-MM-234A, Paragraph 4.5.1 Also, the average time between scheduled maintenance periods shall be 12 months (8760 hours0.101 days <br />2.433 hours <br />0.0145 weeks <br />0.00333 months <br />). To provide a design life of 40 years for the MSIV's/MFIV's, preventative maintenance can be performed in accordance with the vendor's recommendation for changeout.
ADVC submitted qualification documentation based upon normally deenergized, instead of continuously energized, solenoids. These documents were reviewed and accepted by the project.
For Skinner solenoid valves, reanalysis was required to establish qualified service life for the normally energized condition at 135 Vdc (a new condition) and 140*F ambient. ADVC evaluated the qualified life and concluded that it would be less than four (4)' months based upon the methodology and data in the original qualification report (Reference 1),
l which was written based on testing and thermogravinetric analysis.
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Consequently, the project reanalyzed the qualified service life using (1) 4 actual service temperature measurements of solenoid valves energized at 135 Vdc.
(2) manufacturer's data about the nonnetallic cosponents, and (3) analysis shows that the qualified service life is 3.8 year (Reference 2).
1 The safety functions of the MSIV's/MFIV's are tot i
a) Isolate the Steam Generators and Main Steam lines in the event of a pipe rupture to prevent the blowdown of more than one steam generator.
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DER 86 Final Report Page Two b) ' Isolate the containment during a Design Basis Event.
The present circuit design for solenoid coil energization is fail-safe (i.e., valve closes on solenoid coil failure), and thus the failure of the j
coil will not affect'the safety function of the MSIV's/MFIV's. This condition is applicable to all three units.
'The root cause of the equipment qualification report inaccuracy was
- 1) ADVC's Equipment Qualification (EQ) program did not consider the effect
,.of continuous energization of the Skinner solenoid coils in establishing their qualified life.
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- 2) The project's EQ review of the vendor's qualification documentation did not take into account.the continously energized condition of the i
Skinner solenoids.-
Transportability Solenoid Valves Supplied by ADVC to ANPP Under Other Contracts - Under P.O.
l 13-PM-221B, ADVC also supplied power-operated valves using Class 1E ASCO solenoids in the pneumatic control circuit. Since these are normally deenergized,.the present equipment qualification documentation is adequate.
Solenoid Valves Supplied by Other Vendors to ANPP - Three other manufac-g l
turers. ASCO, Target Rock and Valcor, have supplied Class 1E solenoid valves to ANPP under both the C-E scope and BOP scope. The quantities of normally energized solenoids are 25 for ASCO, 12 for Valcor and 15 for Target Rock for a total of 52.
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' The qualification Documentation Packages for the CE-Scope; ASCO solenoid valves (25), Target Rock solenoid valves (2) and Valcor solenoid valves (12) addresses continuous energization at 135 Vdc which is reflected in the respective qualified lives assigned to this equipment.
The remaining 13 Target Rock solenoid valves (BOP Scope) have qualification documentation for the solenoid coil in the normally deenergized condition.
Since BOP valves are similar to NSSS valves in design configuration, mater-ials used, and coil self heating, it can be expected that they also have similar qualified service life. This is being verified under the ongoing BOP equipment qualification program with C-E per ANPP Letter ANPP-32837-JTB/EFG.
These 13 Target Rock solenoid valves are all used in fail-safe design applications so their failure would not adversely affect the safety i
functions of the systems in which they are used.
II.
Analysis of Safety Implications Based upon the above,'this condition is evaluated as not reportable under the requirements of 10CFR50.55(e) and Part 21, since, if left uncorrected, it would not constitute a safety-significant condition.
DER 86 Final Report Page Three III. Corrective Action ANPP will verify that the 13 Target Rock solenoids listed below have suitable qualified service life. Per ANPP-32837-JTB/EFG, June 17, 1985, C-E will provide additional qualification documentation to address the normally energized condition.
HCB-UV-44 SGA-UV-1133 GRB-UV-2 HCA-UV-45 SGA-UV-1134 CAA-UV-2 HCA-UV-46 SGB-UV-1135A IAA-UV-2 HCB-UV-47 SGB-UV-1135B SGB-UV-1136A SGB-UV-1136B This information is expected to be received and reviewed by ANPP by July 30, 1986. This information will then be incorporated into the respective qualification reports for this equipment.
Reference 1.
Qualification and Operability Assurance Report (Log. No. M234A-68-9) 2.
Equipment Change Evaluation (ECE-SG-A014) per ANPP 7I428.07.01.
Attachments A. - Skinner Solenoid Valves Tag List
. - Skinner Solenoid Valves Tag List Details of Skinner Solenoid Valve, Model No. V5H65600, ADVC Part No. W-30248.
A)
The following is a list of solenoid valves in a continuously energized state, when MSIV's/MFIV's are in open condition; MSIV's MFIV's Active A Active B 1,2,3,SGA-UY-170A 1,2,3,SGB-UY-170E 1,2,3,SGA-UY-174A 1,2,3,SGA-UY-180A 1,2,3,SGB-UY-180E 1,2,3,SGA-UY-177A 1,2,3,SCA-UY-171A 1,2,3,SGB-UY-171E 1,2,3,SGA-UY-132A 1,2,3,SGA-UY-181A 1,2,3,SGB-UY-181E' 1,2,3,SGA-UY-137A B)
The following are solenoid valves used in a de-energized condition; MSIV's MFIV's Active A Active B 1,2,3,SGA-UY-170C 1,2,3,SGB-UY-170G 1,2,3,SGA-UY-174C 1,2,3,SGA-UY-180C 1,2,3,SGB-UY-180G 1,2,3,SGA-UY-177C 1,2,3,SCA-UY-171C 1,2,3,SGB-UY-171G 1,2,3,5Ga-UY-132C 1,2,3,SGA-UY-181C 1,2,3,SGB-UY-181G 1,2,3,SGA-UY-137C Note: Status of coil conditions are shown on logic diagrams for MSIV's and MFIV's (Log No. M234A-60 and 57).
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