ML20045A080

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Forwards Inservice Insp Relief Request 93-010 from Volumetric or Surface Exam of 10% of Peripheral Control Rod Drive Housing Welds.All Six CRD Mechanism Housings Will Be Inspected at or Near End of Second 10-yr Interval
ML20045A080
Person / Time
Site: Crystal River Duke Energy icon.png
Issue date: 06/03/1993
From: Beard P
FLORIDA POWER CORP.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
3F0693-03, 3F693-3, NUDOCS 9306090344
Download: ML20045A080 (3)


Text

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Florida Power CORPORATION

  • 5 $$

c June 3, 1993 3F0693-03 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555

Subject:

Relief Request 93-010

Reference:

NRC to FPC, letter dated June 27, 1985 (3N0685-30)

Dear Sir:

Attached please find Relief Request 93-010 for your review and approval. The attachment contains information regarding the component for which exemption - is requested, the requirement, basis for its impracticality, the proposed alternate examination and implementation schedule.

ASME Boiler and Pressure Vessel Code (1983 Edition through Summer of 1983 Addenda),

Section XI, Table IWB-2500-1, Examination Category B-0, Item B14.10 requires volumetric or surface examination of 10% of the peripheral control rod drive housing welds. Florida Power Corporation (FPC) was granted an exemption from that requirement during the first interval (Reference A). For the second interval FPC is proposing the same alternate examination plan granted by the NRC for the first interval. This plan consisted of volumetric examinations of any six control rod drive mechanism (CRDM) housings, approximately 10% of all CRDM housings.

Sincerely, Ak-/ h P. M. Beard, Jr.

Senior Vice President Nuclear Operations PMB:LVC Attachment xc: Regional Administrator, Region II NRR Project Manager Senior Resident Inspector I 070071 i CRYSTAL RIVER NUCLEAR PLANT: Powerline Road P.O. Box 219 + Crystal River, Florida 34423-0219 e (904) 7954486 l;

9306090344 930603 A Florida Progress Company l

PDR ADDCK 05000302 - i G PDR

FLORIDA POWER CORPORATION INSERVICE INSPECTION REl.IEF REQUEST # 93-010 i CRYSTAL RIVER UNIT 3 REFERENCE CODE: ASME Boiler and Pressure Vessel Code,Section XI, 1983 Edition through Summer 1983 Addenda.

I. Component for which exemption is requested:

(a) Control Rod Drive Mechanism Housing (b) Function:

Positions the control rod within the reactor core and indicates the location of the control rod with respect to the reactor core.

(c) ASME Section III Code Class:

Class I (d) Valve Category:

N/A II. Requirement that has been determined to be impractical:

ASME Boiler and Pressure Vessel Code,Section XI, Examination Category B-0, Pressure Retaining Welds in Control Rod Housings, Item 814.10, Volumetric or Surface Examination.

III. Basis for requesting relief:

Relief is requested from the volumetric or surface examination of 10% of the peripheral (approximately 3) control rod drive housing welds. Some CRDMs will be removed for maintenance or cleaning. Radiation exposure can be reduced by examining those CRDM housings that have been removed for maintenance or cleaning rather than examining them on the vessel head.

IV. Alternate Examination:

Volumetric or Surface Examination will be performed on any six CRDM housings which is approximately 10% of all CRDM housings. In order to reduce total occupational exposure at Crystal River Unit 3, the examinations will be performed on CRDMs that have already been scheduled for maintenance or cleaning.

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V. Implementation Schedule:

The six CRDM housings will be inspected at or near the end of the second I

ten-year interval (i.e., during the 1994 or 1996 refueling outages).

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