ML20065B972

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Requests Relief from Article IWB-2000 of ASME Code Section XI,1974 Edition Re Volumetric Exam of Nozzle Welds.Exam of Full Penetration Welds of Nozzles in Vessels Should Be Deferred Until End of 10-yr Insp Interval
ML20065B972
Person / Time
Site: Crystal River Duke Energy icon.png
Issue date: 02/21/1983
From: Westafer G
FLORIDA POWER CORP.
To: Harold Denton
Office of Nuclear Reactor Regulation
References
3F-0283-13, 3F-283-13, TAC-49790, NUDOCS 8302230678
Download: ML20065B972 (2)


Text

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%Q:QbM Florida Power C O A P C e a f a o se February 21,1983 3F-0283-13 Mr. H. R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72 Relief from ASME Section XI, Article IWB-2000

Dear Mr. Denton:

The current Inservice Inspection Program at Crystal River Unit 3 is based upon ASME Section XI,1974 Edition through Summer 1975 Addenda.

This letter requests relief from Article IWB-2000, Table IWB-2500, item B-D, " Full Penetration Welds of Nozzles in Vessels" of ASME Section XI,1974 Edition. This Article requires a volumetric examination of the welds of nozzles in the reactor vessel, the pressurizer, the steam gent ' tors, and the heat exchangers. The 1974 Edition, paragraph IWB-2411 recuires at least 25% of the nozzle inspections be completed by 3-1/3 years following the initial startup and 50% of the inspections be completed by 6-2/3 years.

The 1977 Edition, (which includes Summer 1978 Addenda) of ASME Section XI, Item B-D, Inspection Program B, allows deferral of inspections to the end of the inspection interval provided the requirements of Note (5) are satisfied. Note (5) states that if the examinations are conducted from inside the component by straight beam ultrasonic method, the remaining examinations scheduled for that interval may be performed at the end of the inspection interval.

The required 25% of the vessel nozzles were inspected in 1978 by the straight beam ultrasonic method from the inside of the nozzle. To comply with the 1974 Edition requirements, it will be necessary to lease very costly ultrasonic equipment to perform two reactor vessel nozzle inspections as well as incur radiation doses above that which would be received by including these vessel nozzles as part of a more integrated inspection. When considering that Florida Power Corporation will be inspecting all remaining nozzles at the completion of the 10 year inspection interval and that the 1977 Edition allows deferral of this inspection until the end of the 10 year inspection interval, this requirement is overly restrictive. Thus, Florida Power Corporation requests that the Full Penetration Welds of Nozzles in Vessels be deferred until the end of the 10 year inspection interval (Refuel VII).

8302230678 830221 PDR ADOCK 05000302 O PDR DN General Office 320i Thiny-fou th Streat South e P O Box 14042. St Petersburg. Flonda 33733 e 813-866-5151

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February 21,1983 3F-0283-13 Page 2 Florida Power Corporation would appreciate a telephone conference with your staff as soon as possible to resolve any questions regarding this relief request. Florida Power requests that your written response be included with previous Inservice Inspection Relief Request responses to be issued by your staff April 29,1983.

Sincerely, i s -

G. R. Westafer Manager Nuclear Licensing and Fuel Management RMB:mm i

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