ML20065S116

Forwards Addl Info Re Responses to Agreements & Commitments Concerning Dhr,Per 821020 Meeting W/Nrc

ML20065S116
Person / Time
Site:	Clinch River
Issue date:	10/26/1982
From:	Longenecker J ENERGY, DEPT. OF, CLINCH RIVER BREEDER REACTOR PLANT
To:	Check P Office of Nuclear Reactor Regulation
References
NUDOCS 8211010074
Download: ML20065S116 (10)

Text

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Department of Energy Washington, D.C. 20545 Docket No. 50-537 HQ:S:82:117 OCT 2 c, B82 Mr. Paul S. Check, Director CRBR Program Office Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Check:

ADDITIONAL ITEMS FROM THE DECAY HEAT REMOVAL MEETING 0F OCTOBER 20, 1982 The purpose of this letter is to submit additional items as agreed to in the October 20, 1982, meeting between the Nuclear Regulatory Commission and the Clinch River Breeder Reactor Plant Project.

Any questions regarding the information provided can be addressed to A.Meller(FTS 626-6355) or D. Florek (FTS 626-6185) of the Project Office Oak Ridge staff.

Sincerely, J n R. Longen ker Acting Director, Office of the Clinch River Breeder Reactor Plant Project Office of Nuclear Energy Enclosure cc: Service List Standard Distribution Licensing Distribution 8211010074 821026 PDR ADOCK 05000537 A PDR

Enclosuro 1 Page 1 of 2 Response to Agreenents and Commitments of October 20, 1982, Decay Heat Renovel Meeting

1) .Ltam The results of a delayed initiation and a single f ailure of the Direct Heat Renovel Service were discussed.

Action A table of DHRS operating cases and sensitivities will be added to the docket by October 26, 1982, and included in a f uture PSAR update.

Resoonse That table is provided as attachment I to this encl osure.

2) .Ltam Pump Testing at DHRS Tenperatures. The tenperature testing experience and plans f or the primary and EM pump were discussed.

Action The test experience and plans will be summarized for the EM pump and primary sodium punp and placed on the docket by October 26, 1982, and included in the PSAR in a f uture amendment.

Resoonse This item concerned the capability of the EM pump and the primary sodium pump to operate at the tenperature associated with DHRS operation. For the Na/NaK Electromagnetic punp, testing was perf ormed on the prototype punp in a sodium loop In the Sodium Component Test Installation at the Energy Technology Engineering Center (ETEC) operated by Atomics International. One of the test series consisted of head-flow tests perf ormed at a sodium temperature of 11300F. A cavitation test, variable voltage tests, and head flow mapping tests were perf ormed at 11300F. Figure 1 shows the 11300F Heed-Flow Mapping Eff iciency versus Sodium Flow Rate andssummarizes the EM pump capability at 11300F.

' For the primary sodium pump, tests are to be perf ormed on the prototype punp in a sodium loop In the Sodium Pump Test Facility at ETEC. One of the tests to be conducted involves a heat-up of the test loop sodium by loop heaters and pump power (with the punp on main motor flow) to 11000F over a period of twelve hours. Once temperature has stabilized, the pump will be tripped to pony motcr speed and operated on pony motcr speed for four hours. Temperatur e will then be decreased to 10050F over the next twel ve hours.

These tests will demonstrate the ability of the EM pumps and the primary sodium pumps to operate at the tenperatures associated with DHRS operatt on.

3) .Ltem EM pump capability. The capability of the EM pump within the DHRS was discussed.

Action The results will be sunmarized and placed on the docket by October 26, 1982, and included in a f uture PSAR amendment.

Encicsure 1 Page 2 of 2 Response This item concerned the capability of the EM pump to pep 600 gpm, based on test results, even though it is specified as a 400 gpm fiat, IInear induction, electro-magnetic ptsnp. DurIng the EM pump sodium test program noted in the previous item, head-flow mapping tests were performed at dif ferent sodium temperatures (11300F, 8000F, 6000F, and 4500F) and varying vol tages. Each of the test series at the four temperatures included flow rates of 600 gpm. Figures 1 through 4 plot the Head FIow Mapping Ef fIciency versus Sodium FIow Rate for the four temperatures and refIect the 600 gpm fIow rate at each temperature.

A review of those figures demonstrates the capability of the EM pump at 600 gpm. Additionally, a dest y l imit test was perf ormed to determine the amount of excess capacity available f or emergency operati on. As shown in Figures 5 and 6, a flow rate of 800 gpm is possible at the design limit.

NUMBER EVST NA NAK DHRS NUMBER NUMBER OF IHTS OF DHRS CONSERVATIVE HEAT FLOW FLOW OPERATING PEAK OF PHTS ,

LOOPS TRAINS DECAY HEAT LOAD GPM GPM CASECl) TEMPERATURE LOOPS

• 1120*F 3 0 2 Yes Yes 560 800 Design Case

% 1052*F 3 0 2 Yes (3) Yes 560 800 Updated Design Case Nominal values No 600 600 Single  % 1055'F 2 2 1 Failure Used Evaluation #1 0 Yes No 600 600 Single %1160(2) 2 1 Failure Evaluation #2 I

0 2 Yes (3) Yes 560 800 Delayed  % 1078 3 Start Design Case

(* 45 minutes to DHRS op: ration)

(1) Conservatisms included in all cases: Shutdown at end of cycle at full power; no consideration of insulation losses; no consideration of SGS heat capacity.

(2) Exceeds present DHRS hot leg temperature limit of 1140 F.

(3) Decay heat values have been revised to reflect current conservative design values ATTACHMENT 1. DHRS Operating Cases and Sensitivity Evaluations

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