ML20126K142

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Forwards Addl Info for Review of SEP Topic VI-7.B Re Engineered Safety Features Switchover from Injection to Recirculation Modes in Response to NRC 810227 Request
ML20126K142
Person / Time
Site: Yankee Rowe
Issue date: 05/05/1981
From: Kay J
YANKEE ATOMIC ELECTRIC CO.
To: Crutchfield D
Office of Nuclear Reactor Regulation
References
TASK-06-07.B, TASK-6-7.B, TASK-RR FYR-81-73, NUDOCS 8105120152
Download: ML20126K142 (9)
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Text

{{#Wiki_filter:I YANKEE ATOMIC ELECTRIC COMPANY 4 ~, b C.2 1 1671 Worcester Road, Framingham, Massachusetts 01701 Wxse 11//,' / $(\\ r May 5, 1981 2 \\ gg\\F h 9 i v United States Nuclear Regulatory Commission ,5 $ (/ ,/f Washington, D. C. 20555 pp.... -\\ g Attention: Mr. Dennis M. Crutchfield, Chief ~M l 1 Operating Reactors Branch ll5 Division of Licensing

References:

(a) License No. DPR-3 (Docket No. 50-29) (b) USNRC Letter to YAEC dated February 27, 1981 Subject : Additional Information for SEP Topic IV-7.B, ESF Switchover

Dear Sir:

Reference (b) requested additional information for your evaluation of SEP Topic VI-7.B, ESF Switchover f rom Injection to Recirculation Modes at Yankee Rowe. The attachment has been prepared in response to your six questions. If you have any further questions or desire additional information, please contact us. Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY L f. J. A. Ka y Senior Engineer - Licensing JAK/kab Attachment l THIS DOCUMENT CONTAINS POOR QUAUTY PAGES '8105120lg f

f ATTACRMEN7 Describe the procedures used to switchover f rom the injection to Question (1) the recirculation mode of emergency core cooling (ECC). Re sponse: The recirculation mode of emergency core cooling is initiated when the safety injection tank level reaches 11 feet. The operator performs the following actions: Close the LPSI header isolation valves, CS-MOV-533 and CS-MOV-535 (two a. valves in series). Close the HPSI pump recirculation valves, SI-MOV-48 and SI-MOV-49 (two b. valves in series). Open the vapor container sump suction valves, SI-MOV-516 and SI-MOV-517 c. (two valves in parallel). Close the suction valve from the saf ety injection tank, SI-MOV-518. d. If the vapor container pressure is unknown, or j$ 10 psig, secure all but e. one LPSI and one HPSI pump. Af ter recirculation flow is established, flow may be throttled with the f. HPSI header isolation valve, SI-MOV-46, as required for cooldown. in Copies of saf ety class drawings No. M-7 and M-16 are attached to assist following this procedure. indicator, logic device, and alarm that is For each instrument, Question (2) is used by the operator to perform a manual function or that used to initiate an automatic func tion in the switchover sequence; describe how that device is qualified and installed (e.g. independence and separation of circuits) as Class IE equipment. Re sponse : The operator utilizes redundant safety injection tank level indicators to The information requested on these perform the manual functions required. instruments is included in the response to question 3 Question (3) Describe the level sensing system that is used to indicate or the level in the tank that supplies injection coolant. detect This description should include sensor and data column location, freeze protection, freeze protection power supply and those items specified in (2) above. Re s ponse : Two level sensing systems are utilized to indicate the water level in the One level sensing system is original plant equipment. safety injection tank. This pneumatic measuring loop consists of the following equipment:

f (a) I pneumatic transmitter; Moore Model 174S, Type E884NS s ( b) Level indicator located in the main control room; Bailey type TG200FAA, Model A-330 WAA-327W (c) 1 level indicator; Ashcroft gauge, located in the Primary Aux. Buf1 ding The second level sensing system is electronic, and consists of the following equipment: (a) Electronic transmitter, GE type 555 (b) Level indicator, GE type 180 (c) Power Supply, GE Type 570-06 FAACI Both transmitters, electronic and pneumatic, are individually housed in i electrically heated enclosures located below the Saf ety Injection tank. Freeze protection is maintained by the use.of an electrical heating element in each enclosure. The heaters are powered from a station service bus. Freeze protection is further assured by the location of the equipment; directly.under the insulated tank. The heated tank maintains the insulated area below the tank at a temperature greater than ambient air. For example, with the ambient air measuring 550F, the area below the tank measured 820F. Either mode is sufficient in itself to maintain the transmitters and sensors at proper opera ting temperature. Both modes are operational at all times. The power supply, and the primary indicators, are all located in a non-harsh, cont rolled environment, specifically, in the Main Control Room. B All equipment which is used in these systems were selected as the best available at the time of implementation. ' Independence and separation of both measurement systems have been maintained by separate routings from sensors to control room equipment. Question (4) If injection pumps are not automatically tripped on low level, quantify the level at which the operator must secure these pumps and the time remaining beyond this level (assuming all pumps are running) at which loss of NPSH occurs. Re spons e: The injection pumps are not automatically tripped as all actions are manual. The manual actions required are initiated based on safety injection tank level. At a level of 19 feet in the tank, the operator is required to secure ] one train of safety injection, i.e. one LPSI and one HPS1 pump. At 1 approximately 2 minutes later, the calculated NPSH equals the required NPSH f rom the pump characteristic curves. The switchover from the injection to the recirculation mode is initiated at a level of 11 feet in the tank. With two trains of safety injection operating, i.e. two LPSI and two HPSI pumps, there is approximately 16 minutes before the calculated NPSH equals the required NPSH f rom the pump characteristic curves. l l -..--,__.-r-,,,,

Question (5) Describe the paths of the minimum flow lines from each ECCS pump discharge to the line end. This description should identify all* valves in these lines, the signals that control each valve, the power sources for each valve, and the qualification of each valve. Re sponse: The minimum flow path from each LPSI and HPSI pump is through an individual locked open manual valve and orifice into a common header, then through two motor operated valves in series, discharging into the safety injection tank through a locked open manual valve. The two motor operated valves, SI-MOV-48 and SI-MOV-49, are manually controlled from the control room. Each motor operated valve is operated by a control switch and a key operated switch in series. The power source for one of the motor operated valves is f rom the emergency MCC-2 located in the Saf ety Injection Building and the other is powered f rom MCC-4 Bus 2 located in the Primary Auxiliary Building. The Emergency MCC-2 is normally supplied power from the 5-2 bus and in an emergency is supplied power from the #3 diesel generator. MCC-4 Bus 2 is normally supplied f rom the 4-1 bus and in an emergency is supplied power from the #2 diesel generator. Safety class drawings No. E-1, E-4, and E-5 are attached to allow following these power supplies. The qualification of these two valves is addressed in Acton Environmental Testing Corporation Test Report No. 15421-26. If required, a copy will be supplied. Question (6) For each minimum flow line that returns to a point other than the pump intake point, provide a single failure analysis and quantify the offsite dose rate, dose, and dose assumptions obtaining from all single failures that do not isolate these lines during the recirculation phase of ECC. Re sponse : The minimum flow lines are described in the answer to question No. 5 The common line back to the safety injection tank has two valves in series, powered from dif ferent busses. Therefore, there are no single active failures that will prevent the isolation of this flow path.

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