ML20059L255
| ML20059L255 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 09/14/1990 |
| From: | Fitzpatrick E GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9009260223 | |
| Download: ML20059L255 (7) | |
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OPU Nuoleet Corperetlen j
ou e ou h Forked River, New Jersey 08731-0388 609 971 4000 Wnter's Direct D.a! Number:
i Septanber 14, 1990 U.S. Nuclear Regulatory Commission Attnt Document Control Desk Washington, D.C.
20555 i
i Dear Sire f
Subjects Oyster Creek Nuclear Generating Station f
Docket No. 50-219 End of Second Ten Year Interval for In service Inspections i
The Oyster Creek Nuclear Generating Station is preparing for the final refueling outage to complete the second In Service Inspection ten year interval.
! to this letter notes a boundary where a previously approved AGli!
code case is being invoked. This letter fulfills tlee notification requiremer; to the NRC. Attachmet.ts 2 through 5 to thio letter identify those areas whart l
exemptions are requested as the required examinations: 1) could compromise
-component integrity; or 2) cannot be performed due t.o system configuration.
Alternate examinations.are delineated with each specific test requirement.
Il any further information is required, please contact Mr. John Rogers, at 609-971-4893.
Very truly yours,
$h' E.E. Fit rick Vice President and Director Oyster Creek EEF/JJRijc (JP,-LTRS2 : 12-18 )
Attachments (ce's on next page) i 1
9009260223 900914 PDR ADOCK 05000219 O
PDC (K
GPU Nuclear Corporation is a subsidiary of General Pubhc Utihties Corporation 1'
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Mr. Thomas Martin, Administrator Region 1 U.S.' Nuclear Reguistory Commission 475'A11ondale Road King of Prussia, PA 19406 NRC Resident Inspector Oyster Creek Nuclear Generating Station Mr. Alexander Dromerick U.S. Nuclear Regulatory Commission Mail Station F1-137 Washington, DC 20555 4
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Attachment I t
Systems MAIN STEAM; Class O Boundary Identification:
ASME Code Section XI, 1980 Edition through Winter 1981 i
Addenda; IWC-5222 " System Hydraulic Test" for pressure l'
test requirements.
Required Examination:
Hydrostatically test each Main Steam Line between the outboard main steam isolation valve (MSIV) and the turbine stop valve to 1.25 times the design pressure (test pressure approximately 1562.5 psig).
l Alternate i
Examination:
Invoke Code Cas% No. N-479.
The system hydrostatic test of the class 2 boundary portion shall be performed in conjunction with the Class 1 system hydrostatic test to 1.1 times the operating pressure (test pressure j
"pproximately 1122 poig), and shall meet the requirements i
I Basis for Alternate The MSIV is not designed to withstand pressure in the Exsminations reverse direction. The class 2 boundary hydrostatic pressure would open the valve.
This would necessitate the design and procurement of two plugs, one for each MSIV.
Each plug would have to retain 540,000 lbf.
without causing seat damage to the MSIV internals.
This would also necessitate the complete disassembly and reassembly of the two MSIVs. The required time to disassemble the valves, install the plug and reassemble the valve is 20 days. This does not include the 10CFR50 Appendix J Type C test which would be required after the evolution was complete.
Code Case N-479 has been previously approved by the NRC.
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Attachment II b
i Systems DEMINERALIEED WATER TRANSFER; Class 2 Boundary Identification:
ASME Code Section XI, 1980 Edition through Winter 1981 Addenda; IWC-5222 " System Hydraulic Test" for pressure test requirements.
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Required l
Examination:
Hydrostatically test boundary piping penetrating the Drywell walls to 1.10 times the design pressure (test i
pressure approximately 192.5 psig.)
Alternate Examination:
Preoperational test for leak tight integrity; 10CFR50 Appendix J containment testing.
Basis for Exemption:
The purpose of this line is te supply domineralized water to the drywell during refueling outages. During normal operations, the portion of this system penetrating the i
primary containment is disconnected and blind flanged both inside and outside containment. Therefore, although the domineralized water system is classified ASME Code class 2 in 10CTR50.55a(g), it does not require pressure testing beyond that described in 10CFR50 Appendix J as it is not connected during normal operations.
I Attachment III Systems CONTROL ROD DRIVE AND SCRAM DISCHARGE VOLUME; Class 2 Boundary Idontification:
ASME Code Section XI, 1980 Edition through Winter 1981 Addenda; IWC-5222 " System Hydraulic Test" for pressure test requirements.
Required Examination:
Hydrostatically test the control Rod Drive and Scram Discharge Volume systems from the 106 valves to the Scram Discharge Volume at 1.25 times design pressure (test pressure is approximately 2013 psig).
Alternate Examination:
Manually scram the system by opening the 126 and 127 valves in order to establish a flow path between the hydraulic control units and the scram discharge volume during the class 1 boundary pressure test (test pressure approximately 1122 psig).
Basis for Exemption:
The design of the control Rod Drive mechanism allows leakage past the piston and collet housing.
This makes it impossible to test the control Rod Drive piping to class 2 pressures without overpressurizing the reactor pressure vessel.
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i bttachment ly l
l System CORE SPRAY AND CONTAINMENT SPRAY AND CLEANUP DEMINERALIEERS) Class 2 Boundary i
e Identifications ASME Code Section XI, 1980 Edition through Winter 1981 Addenda; IWC 5222 " System Hydraulic Test" for pressure test l
requirements.
i Required Examination Hydrostatically test the core spray, containment spray, and l
cleanup domineralizer systems between the torus and the E
first isolation valve other than a check valve to 1.25 times design pressure (test pressure approximately 187.5 psig).
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. Alternate Examination:
Invoke IWC-5222(c). Ooen ended portion of suction or drain l
line from a storage tank shall be considered as an l
extension of the tank up to the first shutoff valve from i
the tank.
l Basis for Exemption:
The torus is a storage tank designed for 35 psig. This design exceeds the conditions identified in IWC-5222(b).
Leakage testing is performed in accordance with 10 CFR 50 Appendix J.
A general inspection of the accessible l
interior and exterior surfaces of the containment structures and components is performed to verify leak tightness for the portions of the core spray and containment spray systems identified in this attachment.
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h Attachment V I
Systems ISOLATION CONDENSER; Class 3 Boundary Identification:
ASKE Code section XI, 1980 2dition through Winter 1981 Addanda; IWC-5222 " System Hydraulic Test" for pressure test requirements.
Required Examination:
Hydrostatically test the shell side of the Isolation condenser and connected piping to 1.25 times design pressure (test pressure approximately 18.75 psig) l Alternate Examination Utilize IWD-5223(b) test requirements for class 3 hydrostatic tests on atmospheric storage tanks.. Perform a pressure test with hydrostatic head pressure of its normal water volume (22,730 gallons) which correlates to 7.2 feet, approximately one foot above shell centerline.
The 20" vent lines and the overflow lines shall be i
excluded as they are above the normal water level.
Basis for Exemption:
Both Isolation Condensers are continuously vented to atmosphere through 20" ver.t lines, which combine into a single 28" header on the B Isolation condenser.
There is no provision to isolate this system from the atmosphere and installing plugs in the vent lines would require erecting t. work platform approximately 100' above the ground. As the specified class three boundary test
-i pressure is less than 20 psig, the expense and risk to I
personnel safety cannot be justified.
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