ML20066D575
| ML20066D575 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 01/11/1991 |
| From: | J. J. Barton GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| C321-90-2042, NUDOCS 9101150193 | |
| Download: ML20066D575 (5) | |
Text
,o GPU Nuclear Corporation Nuclear
= = = 3" Forked River, New Jersey 087310388 609 971 4000 Wnter s Direct Dial Nurnber, January 11, 1991 C321-90-2042 U.S.
Nuclear Regulatory Commicolon Attna Document Control Desk Wachington, D.C.
20555 Dear Sir Subjects Oyster Creek Nuclonr Generating Station Docket No. 50-219 Additional Information on In Service Inopections for the End of the Second Ten Year Interval By letter dated September. 14, 1990, OPU Nuclear requested four exemptions from ASME Ten Year Interval hydrootatic tenting requiremento.
Subsequent to that letter, a telecon took place-in which OPUN was requested to provide additional information.
The enclosure to this letter contains the requisite information.
If any further information is. required, pleano contact Mr. John Rogero, Oyster Creek Licenning Engineer at 609-971-4893.
i
' ry truly yours,
/
\\
J.J rton Di or, Oyoter Creek
'JJB/JJR/jo Enclosure 910115019's 910111 ADOCK0500g9 PDR a
GPU Nuclear Corporation is a subsidiary of General Pubhc UtStios Corporation yf 14 1!%
///
.d ces Mr. Thomas Martin, Administrator Region i U.S. Nuclear Rogulatory Commission 475 Allendale Road King of Prussia, PA 19406
-NRC Resident Inspector oyster Creek Nuclear Generating Station Mr. Alexander Dromerick U.S. Nuclear Regulatory Commission Mail Station P1-137 Washington, DC 20555 (C3212042) l l.
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ENCLOSURE D
C3212041 Page 1
-QPUN Letter dated 9/14/90
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Attachment III
[ System
' CONTROL ROD DRIVE AND SCRAM DISCHARGE VOLUME; Class 2 Boundary Identification:
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 drain valves at 1.25 times design pressure (test pressure is approximately 2013 poig).
Alternate Close the Scram Discharge Volume (SDV) Drain valves and Vent Examinations valves, insert and maintain a manual scram by opening.the 126 and 127 valves-to fill and pressurize the hydraulic control' units and the scram discharge, volumes, and perform the Class i boundary-pressure test (test pressure-approximately 1122 poig).
-Basis for
. Exemption:
The design'of the control Rod Drive mechanism (CRDM) allows
' leakage pastJthe piston and collet housing.
This leakage provides: cooling water flow:forLthe CRDM,-but makes it nearly impossible to perform a Class-2 boundary hydrostatic test on;the Control Rod Drive piping external to the hydraulic control unit (HCU):without overpressurizing the reactor-pressure vessel.
-The only way. th'e piping -and the HCU can be tested 'is :to removenthe-CRDM and-install a blank flange on each of_the-CRD housing flanges. -- Although this is=a new-construction p
post : installation ; test ; requirement, the massive exposure:
required to perform this evolution now on all 137 CRDMs cannot be1justifled.
As noted in the attached > drawing,-only about 4 feet,of approximately 210ffeet of the CRD piping is internal to the HCU and testable. Testing this piping would require 137
- separate hydrostatic pressure tests and would result in~1ess than'24 of the actualipipe run being pressurized.-
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-ENCLOSURE x,
C3212042 1
Page 2'
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The.SDV system is downstream.of the HCU and communicates-with the reactor pressure vessel. Therefore, with the SDV..
l' drain. valve closed, the SDV can never'see a pressure greater t
than reactor pressure.- Performing an ASME hydrostatic test
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i would require another.two' separate tests.
The amount of radiation exposure required to test this downstream portion-of the CRD system cannot be justified to perform the ASME ten year test.-
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Finally, the NSSS' vendor Operations Engineer surveyed.
boiling water; reactors with experience-in ten year j
' hydrostatic test requirements.. The respondents either had j
exemptions from testir.g the CRD/SDV system,'or'had requested those exemptions from-Class 2 requirements.
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