3F1184-15, Forwards Response to IE Bulletin 84-03 Re Potential for & Consequences of Refueling Cavity Water Seal Failure & Summary Rept of Actions.No Changes Need Be Made to Configuration or Emergency Operating Procedures
| ML20101C461 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 11/20/1984 |
| From: | Westafer G FLORIDA POWER CORP. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 3F1184-15, IEB-84-03, IEB-84-3, NUDOCS 8412210090 | |
| Download: ML20101C461 (5) | |
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November 20,1984 3F1184-15 Mr. 3. P. O'Reilly Regional Administrator, Region II Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission 101 Marietta Street N.W., Suite 2900 Atlanta, GA 30323
Subject:
Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72 IE Bulletin 84-03 Refueling Cavity Water Seal
Dear Sir:
Attached is Florida Power Corporation's response to the subject IE Bulletin.
Sincerely, o
G. R. Westafer Manager, Nuclear Operations Licensing and Fuel Management Attachment EMG/feb i
cc:
Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 gg %
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GENERAL OFFICE 3201 Thirty fourth Street South e P.O. Box 14042, St. Petersburg, Florida 33733 e 813-866 5151
3 IE BULLETIN 84-03 REFUELING CAVITY WATER SEAL FLORIDA POWER CORPORATION'S RESPONSE IE Bulletin Requirements Evaluate the potential for and consequences of a refueling cavity water seal failure and provide a summary report of these actions.
Such evaluations should include consideration of a gross seal failure; maximum leak rate due to failure of active components such as inflated seals; makeup capacity; time to cladding damage without operator action; potential effect on stored fuel and fuel in transfer; and emergency operating procedures.
Florida Power Corporation's Response The refueling cavity water seal at Crystal River Unit 3 (CR-3) has been used for approximately seven years with no significant leakage. It is not similar to the seal used at the Haddam Neck Plant. The passive seal system at CR-3 consists of a stainless steel ring with two non-inflatable rubber seal rings. One rubber seal is positioned between the steel ring and the reactor vessel flange. The other rubber seal is positioned between the steel ring and the refueling canal floor. These rubber seal rings are compressed between the surfaces with stainless steel bolts.
Figure 1, depicting the CR-3 seal design, is attached. Due to this configuration, any possible seal leakage would be insignificant compat ed to the makeup capability at CR-3. The steel seat ring width is greater than the opening it covers, therefore, gross seal failure due to leck of interference between the width of the seal annulus and the width of the opening as described in IE Bulle!!n 84-03 is not considered probable at CR-3.
Assuming that the seal could fall and the water would be allowed to drain through the annular opening between the reactor vessel and the refueling canal floor, the resulting water level in the refueling canal would be at the 135 foot elevation (elevation of the refueling cavity water seal). Due to plant configuration, fuel stored in the reactor, the transfer tube area, and the spent fuel storage area would l
remain covered by the water during such an occurrence. The relative locations of these areas are shown in Figure 2.
l As a result of the review of the CR-3 refueling cavity water seal design, it has been determined that no changes need to be made to the plant configuration or emergency operating procedures to assure that fuel exposure during refueling l
remains an unlikely event.
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STATE OF FLORIDA
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COUNTY OF PINELLAS G. R. Westafer states that he is the Manager, Nuclear Operations Licensing and Fuel Management for Florida Power Corporation; that he is authorized on the part of said company to sign and file with the Nuclear Regulatory Commission the information attached hereto; and that all such statements made and matters set forth therein are true and correct to the best of his knowledge, information, and belief.
J e
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G. R. Westafer Manager, Nuclear Operation /
s Licensing and Fuel Management Schscribed and sworn to before me, a Notary Public in and for the State and County above named, this 20th day of November,1984.
Notary Public
/
i Notary Public, State of Florida at Large, 1
My Commission Expires: November 19,1986 i
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