ML043440350

Request for Additional Information Regarding Spent Fuel Pool Davit Crane Design Application (TAC No. L52634)

ML043440350
Person / Time
Site:	Humboldt Bay
Issue date:	12/09/2004
From:	John Hickman NRC/NMSS/DWMEP/DD
To:	Rueger G Pacific Gas & Electric Co
References
TAC L52634
Download: ML043440350 (5)

Text

December 9, 2004 Mr. Gregory M. Rueger Senior Vice President - Generation and Chief Nuclear Officer Pacific Gas and Electric Company Diablo Canyon Nuclear Power Plant P. O. Box 3 Avila Beach, CA 93424

SUBJECT:

HUMBOLDT BAY POWER PLANT, UNIT 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING SPENT FUEL POOL DAVIT CRANE DESIGN APPLICATION (TAC NO. L52634)

Dear Mr. Rueger:

The NRC staff has reviewed and evaluated the information provided by the Pacific Gas and Electric Company for Humboldt Bay Power Plant, Unit 3 in its License Amendment Request 04-02, Spent Fuel Handling Davit crane design application, and has determined that additional information is needed to complete our review. Attached to this letter is the Request for Additional Information.

Sincerely,

/RA/

John B. Hickman, Project Manager Decommissioning Directorate Division of Waste Management and Environmental Protection Office of Nuclear Material Safety and Safeguards Docket No.: 50-133

Enclosure:

Request for Additional Information cc: See next page

December 9, 2004 Mr. Gregory M. Rueger Senior Vice President - Generation and Chief Nuclear Officer Pacific Gas and Electric Company Diablo Canyon Nuclear Power Plant P. O. Box 3 Avila Beach, CA 93424

SUBJECT:

HUMBOLDT BAY POWER PLANT, UNIT 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING SPENT FUEL POOL DAVIT CRANE DESIGN APPLICATION (TAC NO. L52634)

Dear Mr. Rueger:

The NRC staff has reviewed and evaluated the information provided by the Pacific Gas and Electric Company for Humboldt Bay Power Plant, Unit 3 in its License Amendment Request 04-02, Spent Fuel Handling Davit crane design application, and has determined that additional information is needed to complete our review. Attached to this letter is the Request for Additional Information.

Sincerely,

/RA/

John B. Hickman, Project Manager Decommissioning Directorate Division of Waste Management and Environmental Protection Office of Nuclear Material Safety and Safeguards Docket No.: 50-133

Enclosure:

Request for Additional Information cc: See next page DISTRIBUTION DCD r/f DGillen CCraig JHickman BSpitzberg, RIV EGarcia, RIV SJones, NRR AWong, NRR RidsRgn4MailCenter BSmith MBupp ML043440350 *See previous concurrence OFFICE DCD/PM* DCD/LA DCD/SC NAME JHickman TMixon CCraig DATE 12/09/2004 12/09/2004 12/09/2004 OFFICIAL RECORD

REQUEST FOR ADDITIONAL INFORMATION RELATED TO SPENT FUEL POOL DAVIT CRANE DESIGN APPLICATION PACIFIC GAS AND ELECTRIC COMPANY HUMBOLDT BAY POWER PLANT, UNIT 3 DOCKET NO. 50-133

1. The Holtec Humboldt Bay Davit Crane Specification (submitted to NRC as an attachment to the 08/17/04 PG&E letter HBL-04-022) page 3 states that The two strand jacks operating in parallel combine to raise the total working load to 264 tons. Page 7 of 22 of the NUREG-0554/NUREG-0612 Compliance Matrix states that The strand jack collets automatically adjust for slack in any individual stand so that the strands will be evenly loaded.

a. Describe how these two stand jacks automatically operate in unison to lift the load evenly.

b. Describe means to correct uneven lifting if such problem is discovered.

c. Describe the effect of uneven loading on the ability of the crane to stop and hold the load and to what extent stresses in load bearing members were evaluated for uneven loading conditions.

2. The Holtec Humboldt Bay Davit Crane Specification (submitted to NRC as an attachment to the 08/17/04 PG&E letter HBL-04-022) page 4, 5.3 states that hydraulic pressure in the strand jacks is regulated to protect against a two-blocking event.

Page 8, item g limit switch failure of the same report states that The effect of one of the redundant independent limit switches to stop the lift prior to hard contact of the Davit Crane members would be that the hydraulic pressure relief valves would limit the lift force. Page 11 of 22 of the NUREG-0554/NUREG-0612 Compliance Matrix Section 4.5, item 2 Compliance Evaluation states that The protective control system will use two independent upper and two independent lower limit switches. These devices are independent of the drive control system.

a. Describe how the hydraulic pressure is regulated/relieved. Please include a discussion on the failure of such mechanism because this failure is not included in Section 7 Davit Crane and Strand Jack Failure Modes and Effects Analysis. Are manual actions required? If so, briefly describe the complexity of the manual actions.

b. Describe how the switches function and how they are independent from each other and from the drive control system. What is the sequence of events when one (or both) switch is activated?

3. The Holtec Humboldt Bay Davit Crane Specification (submitted to NRC as an attachment to the 08/17/04 PG&E letter HBL-04-022) pages 11 thru 13 of 22, addressing the NUREG-0554/NUREG-0612 Compliance Matrix Sections 4.5 and 4.9, states that The Davit Crane does not employ holding brakes. Stopping and holding are passive safety features of the hydraulics.

a. Describe the passive safety features of the hydraulics. In particular, how it stops and holds the load. Also, describe how dynamic effects from the jacking are controlled and were considered in the design of load-bearing elements.

b. Describe the dynamic effects on the system from other postulated sudden movements. For example, upon loss of hydraulic power (e.g., rupture of a hydraulic line), what is the impact on the system/load when the two vertical booms fall suddenly from a vertical position (90 o) to a fully-extended position over the spent fuel pool? Can the Davit Crane be manually brought to a safe state upon loss of power?

c. Describe how the effects of wear and the resulting reduction in frictional load holding capacity will be monitored and controlled during the life of the crane.

4. Page 18 of 22 of the NUREG-0554/NUREG-0612 Compliance Matrix Sections 6.6 item 1 Compliance Evaluations states that An O&M manual will be provided with the Davit Crane. That statement did not directly address the location of operating and emergency controls issue.

Describe the location of operating and emergency controls. Are they located on or near the crane where the crane operator can directly observe the crane movement?

5. Page 49 of 68 of the Enclosure to the PG&E Letter HBL-04-016 (July 9, 2004) states that This probabilistic evaluation determined that the probability of a cask drop causing a radiological release exceeding the guidelines of 10 CFR or a criticality event was less than 1x10-7 and therefore was not credible.

Describe the sequence of events that led to the cask dropping and how the cask dropping probability was determined. In particular, please focus on the areas where either human actions or hardware failures were involved.

Humboldt Bay Power Plant, Unit 3 Service List cc:

Mr. Gregory M. Rueger Regional Administrator, Region IV Senior Vice President - Generation U.S. Nuclear Regulatory Commission and Chief Nuclear Officer 611 Ryan Plaza Drive, Suite 400 Pacific Gas and Electric Company Arlington, TX 76011-8064 Diablo Canyon Nuclear Power Plant California Public Utilities Commission P. O. Box 3 505 Van Ness, Room 4102 Avila Beach, CA 93424 San Francisco, CA 94102 Mr. Lawrence F. Womack, Vice President, California Public Utilities Commission Power Generation & Nuclear Services 505 Van Ness, Room 4102 Diablo Canyon Power Plant San Francisco, CA 94102 P. O. Box 56 Avila Beach, CA 93424 Redwood Alliance P.O. Box 293 Mr. Roy Willis, Plant Manager Arcata, CA 95521 Humboldt Bay Nuclear Power Plant Pacific Gas & Electric Company Dr. Rich Ferguson, Energy Chair 1000 King Salmon Avenue Sierra Club California Eureka, CA 95503 1100 11th Street, Suite 311 Sacramento, CA 94814 R. Terry Nelson, Director Fossil Generation Mr. Ed Bailey, Radiation Program Director Mail Code N11E Radiologic Health Branch Pacific Gas & Electric Company State Department of Health Services P.O. Box 770000 P.O. Box 997414 (MS 7610)

San Francisco, CA 94177-0001 Sacramento, CA 95899-7414 Mr. Richard F. Locke, Esq. Commissioner Law Department California Energy Commission Pacific Gas & Electric Company 1516 Ninth Street Post Office Box 7442 Sacramento, CA 95814 San Francisco, CA 94120 Deputy Attorney General Chairman, Humboldt County Board State of California of Supervisors 110 West A Street, Suite 700 County Courthouse San Diego, CA 92101 825 Fifth Street Eureka, CA 95501 Mr. Steve Hsu Radiologic Health Branch State Department of Health Services P.O. Box 997414 (MS 7610)

Sacramento, CA 95899-7414 December 2004