ML20010J218

Forwards Description of Possible Methods for Boration from Outside Control Room in Response to NRC 810901 Request for Addl Info Re Hot Shutdown.Details Re Reactor Vessel Head Vent Sys Provided

ML20010J218
Person / Time
Site:	Wolf Creek, Callaway
Issue date:	09/22/1981
From:	Petrick N STANDARDIZED NUCLEAR UNIT POWER PLANT SYSTEM
To:	Harold Denton Office of Nuclear Reactor Regulation
References
SLNRC-81-111, NUDOCS 8109290724
Download: ML20010J218 (4)

Text

"

e SNUPPS Standardized Nucteer Unit Power Plant System 5 Choke Cheery Road Nicholas A.Petrick RodviHe, Marytend 20050 Executive Director (300 ses.colo September 22, 1981

@(/ '

SLNRC 81-111 FILE: 02 rp/~

j 4 '/

SUBJ: ICSB Review g Qg /, h Mr. Harold R. Denton, Director i,4 -

Office of Nuclear Reactor Regulation N %%sy *N;Kg(9g/g F

U. S. Nuclear Regulatory Consnission p\V,x s; Washington, D. C. 20555 Q. A  ;/

4 ., s Docket Nos. STN 50-482, STN 50-483, and STN 50-486 /I ngy

Reference:

SLNRC 81-82, dated September 1,1981: Same subject

Dear Mr. Denton:

The referenced letter discussed extended hot shutdown from outside the control room and.provided the appropriate FSAR changes to Section 7.4.3.1.3. Subsequent to the submittal of the reference, the NRC requested additional details on the measures that would have to be taken from locations other than the auxiliary shutdown panel in order to maintain hot shutdown. As discussed with the NRC staff, after an extended period boration of the reactor coolant system would be required. The enclosure to this letter provides a description of the possible methods for boration from outside the control room.

Concerning the SNUPPS reactor vessel head vent system, the following information is provided. The system is described in FSAR Section 18.2.1.2 and shown on Figures 5.1-1 (sheet 1) and 18.2-1. The vent valves have the following arrangement:

a. Two separation group 1 solenoid operated valves in series,

! (i.e., BBHV8001 A and BBHV8002A) are in parallel with two l ether series, separation group 4 soles:id operated valves I

(i.e. , BBHV8001B and BBHV8002B).

b. Each of the four valves has its own limit switch, hand indicating switch and computer point for valve control and indication.

QDOS

c. The cables associated with valve BBHV8001A are routed separately 5 from the cables associated with valve BBHV8002A. f Ill 8109290724 810922 '

PDR ADOCK 05000483 A PDR.

SLNRC 81- 111 Page Two

d. -The cables associated with valve BBHV8002B are routed separately from the cables associated with valves BBHV800lB.

e. The hand indicating switch for each valve's control employs two maintained contacts in series.

Very truly yours,

[ -E % CY d Nicholas A. Petrick RLS/mtk Enclosure cc: J. K. Bryan UE D. F. Schnell UE G. L. Koester KGE D. T. McPhee KCPL W. A. Hansen NRC/ CAL T. E. Vandel RRC/WC i

i l'

i s

+

L._.._..____.____.._........._.._._._

e BORATION FR00 OUTSIDE THE CONTROL ROOM Boron can be added to the Reactor Coolant System (RCS) from outside of the control room by manual control of the charging system via controls at the auxiliary shutdown panel, motor control centers, swireAgears, and local control at the device location. Boration can be accomplishea without lifting leads and without jury-rigging. One method of adding boric acid is as follows:

A. Transfer boric acid from the boric acid tanks to the suction of the centrifugal charging pumps. Refer to FSAR Figure 9.3-8, sheets 3 and 5.

! 1. Start boric acid transfer pump (s) via local control switches (Location: Auxiliary Building room No. 1117 for "A" pump, and room 1116 for "B" pump)

2. Open valve HV-8104 via the manual handwheel (Location: Auxiliary Building room No. 1112)

B. Deliver boric acid, via the centrifugal charging pump (s), through the BIT path to the RCS. Refer to FSAR Figure 9.3-8, sheet 3 Figure 6.3-1, sheet 3 and Figure 5.1-1, sheet 1.

1. Start the centrifugal charging pumps at the switchgear (Location:

Control Building room No. 3301 for "A" pump. room No. 3302 for "B" pump)

2. Open valve HV-8803A or HV-8803B via the manual handwheel (Location:

Auxiliary Building room No. 1126)

3. Open valve HV-8801A or HV-8801B via the manual handwheel. (Location:

Auxilairy Building room 1323)

An alternate means to transfer boric acid to the RCS would be as follows:

A. Transfer boric acid to the suction of the charging pump via valve FCV 110A (Location: Auxiliary Building room No. 1112) which can be opened by reducing the valve air regulator set pressure. Refer to FSAR Figure 9.3-8, sheet 5. ,

B. Deliver boric acid to the RCS, via the charging pumps, through the normally aligned regenerative heat exchanger or reactor coolant pump seal path. All valves in these paths are normally open and fail open since all motor operated valves are normally open. Refer to FSAR Figure 9.3-8, sheets 1 and 3, and Figure 5.1-1, sheets 1 and 3.

Under certain reactor core conditions it may be necessary to letdown reactor coolant so that a sufficient quanity of boric acid can be added to the RCS.

Reactor coolant letdown can be accomplished from outside of the control room without lif ting leads and without jury-rigging.

Manual control of letdown to the volume control tank can be accomplished by controls at the auxiliary shutdown panel and by reducing air operated valve air regulator set pressures. The valves necessary for letdown and associated information concerning control of these valves are shown below (

Reference:

FSAR Figure 5.1-1, sheet 1, and rigure 9.3-8, sheets 1 and 2).

)

l l

l

, VALVE TAS NO. CONTROL LOCATION NORMAL VALVE POSTION VALVL FAILURE POSITION LCV-460 Auxiliary Shutdown Panel Open Cloesd LCV-459 Auxiliary Shutdown Panel Open Closed HV-8149C Auxiliary Shutdown Panel Open Closed HV-814'B Auxiliary Shutdown Panel Closed Closed HV-814E Auxiliary Shutdown Panel Closed Closed HV-8160 Auxiliary Shutdown Panel Open Closed HV-8152 Auxiliary Shutdown Panel Open Closed TCV-381B Auxiliary Bldg. Room #1125 Open Open PCV-131 Auxiliary Bldg. Room #1125 Open Open TCV-129 Auxiliary Bldg. Room #1125 Aligned to Demineralizer Aligned to Volume Control Tank LCV-Il2A Auxiliary Bldg. Room #1302 Aligned to Demineralizer Aligned to Volume Control Tank

. .. - - . . . . - . _ -- - .- .