ML20027D531
| ML20027D531 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 11/02/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| SBN-350, NUDOCS 8211040453 | |
| Download: ML20027D531 (10) | |
Text
I J
sana a sum lPUBLIC SERVICE
.,.:: _.,, Office:
Companyof New Hampshire 1671 Worcester Rcod Framinoham, Massachusetts 01701 (617) -872 - 8100 November 2, 1982 SBN-350 T.F. B7.1.2 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Mr. George W. Knighton, Chief Licensing Branch 3 Division of Licensing
References:
(a) Cons truction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) USNRC Letter, dated February 12, 1982, " Request for Additional Information", F. J. Miraglia to W. C. Tallman (c) PSNH Letter, dated March 12, 1982, " Responses to 410 Series RAIs; (Auxiliary Systems Branch)", J. DeVincentis to F. J. Miraglia (d) PSNH Letter, dated July 27, 1982, " Revised Responses to 410 Series RAls; (Auxiliary Systems Branch)", J.
DeVincentis to F. J. Miraglia (e) PSNH Letter, dated August 27, 1982, " Amendment 46 to March 30, 1973, Application to Construct and Operate Seabrook Station Unit 1 and Unit 2", W. P. Johnson to F. J. Miraglia
Subject:
Revised Response to RAI 410.25; ( Auxiliary Systems Branch)
Dear Sir:
In Reference (d) we submitted a revised response to Auxiliary Systems Branch Request for Additional Information (RAI 410.25). This revised response was subsequencly incorporated into the FSAR [0L Application Amendment 46; Reference (e)].
We are again revising our response co RAI 410.25 and the corresponding FSAR Section 9.2.5.3c per discussions with the Auxiliary Systems Branch Reviewer (Mr. Raj Anand).
We have enclosed the following information for Auxiliary Systems Branch Review:
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1.
Revised response to RAI 410.25, Part (1).
2.
Revised FSAR Section 9.2.5.3c.
8211040453 821102 PDR ADOCK 05000443 A
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United States Nuclear Regulatory Commission November 2, 1982 Attention:
Mr. George W. Knighton Page 2 3.
A list of referenced drawings of tunnel cross-sections and routings from tunnels to intake structure to pump house.
4.
One Service Water Pump curve.
5.
Service Water System - Yard Plan (UE&C Drawing No. 9763-F-202500).
Items 1 and 2 from above will be included in Amendment 48 to the OL Appilcation.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY i
J. DeVincentis Project Manager ALL/fsf f
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SB 1 & 2 Amsndment 46 FSAk August 1982 1.
PCCW supply and return containment isolation valves - both inside and outside containment - valve position indication, 2.
RCP seal-cavity temperatures, and 3.
RCP motor bearing and stator temperatures.
In addition, two Class 1E transmitters will be provided to redundently monitor the combined flow from the upper and lower bearing oil coolers and the motor air coolers for each pair of RCPs (total of four instruments). These safety-related transmitters will provi'de flow indication on demand.and actuate low flow alarms in the control room.
Independent alarms will be provided on the annunciator and the video alarm system.
4 Operating procedures will be provided for a loss of component cool-ing water and seal injection to the reactor coolant pumps and/or motors.
Included in these operating procedures will be the pro-vision to trip the reactor if component cooling water flow, as indicated by the instrumentation discussed above, is lost to the reactor coolant pump motors, and cannot be restored within 10 minutes.
The reactor coolant pumps will also be tripped following the reactor trip. Since both of these operations are performed at the main control board, these evolutions can be performed within the 10-minute time frame.
A to RAI 410.25 (9.2.5)
(1) The ultimate heat sink cooling tower basins are only provided with a seven day water supply. No permanent makeup system is provided.
It is our position, in accordance with Regulatory Guide 1.27, that the ultimate heat sink must have a continuous capability to maintain the plant in a safe shutdown condition for at least 30 days. Therefore provide data showing the maximum makeup water demand of the cooling tower throughout I
the 7-30 day period.
l Provide a detailed descriptica of the (plan) to use portable pumping equipment.to. furnish. makeup water to the cooling tower in the event of I
total blockage of both ocean tunnels. Describe the capabilities of these portable pumps to provide continuous makeup water from natural water sources following depletion of the cooling tower basin.
In this description consider the source of power for the portable pumps and the time for erection of the equipment including the restrictions to freedom of movement following a seismic event of sufficient magnitude to block i
l both ocean tunnels. Describe the locations at which makeup water could be taken from natural sources, the low tide water levels or the fresh water. capacities available, at these locations, the length of portable pipe used and pump suction conditions imposed while pumping from these
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SB 1 & 2 Amendment 46
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FSAR August 1982 remote locations. Verify that a sufficient length of portable pipe is stored to reach a reliable water source and that the system could be erected over the terrain selected in the required time.
(2) FSAR Section 9.2.5.3 indicates that even after an SSE, use of the cool-ing tower as the ultimate heat sink would only be necessitated by 95 percent blockage of a circulating water tunnel. Discuss whether the underground 42" SSW intake pipes that convey the water frcm the transition structures to the service and circulating water pumphouse could be damaged by erosion as a result of failure of the circulating water system and describe any design provisions to mitigate this damage. Also discuss the-effects of" suspended sediment on the operability.of.the system for at least 30 days.
(3) FSAR Section 9.2.5.3 states that the entire ultimate heat sink cooling tower structure is designed to withstand tornado missiles.
FSAR Section 1.8 under Regulatory Guide 1.117 and Section 3.5 contradict this state-ment. Clarify this apparent discrepancy.
RESPONSE
(1) FSAR Subsection 9.2.5.3c. has been revised in Amendment 45 to reference a new Figure 9.2-9 on maximum makeup water demand of the cooling tower.
dl This Subsection was further revised in Amendment 46
('
ammines===mumma 4G (2) In the unlikely event of an SSE which resulted in damage to the circu-lating water system of sufficient severity to, in turn, cause damage to the 42" service water supply lines to the pumphouse and subsequent loss of suction to the service water pumps, the cooling tower would be auto-matically actuated to cerve as the ultimate heat sink. Hence, any sus-pended sediment resulting from the break in these lines would have no l
effect on the operability of the system.
4 (3) This discrepancy will be greatly clarified if the reference to Section 3.3.2 (apparently a typographical error) is changed to read "See Section 3.5.2" in the last paragraph of Section 9.2.5.3b.
The last paragraph of Section 3.5.2 contains information which clarifies the missile pro-
_. f tection provided. The entire structure is designed to withstand tornado generated missiles as qualified by the exceptions of Section 3.5.2.
RAI 410.26 (9.2.5)
Table 9.2-12 states that the ultimate heat sink cooling tower design wet bulb temperature is 750F.
Provide the basis for this number and the design m
dry bulb temperature and demonstrate that it is sufficiently conservative to conform with Regulatory Position 1 of Regulatory Guide 1. 27 with regard to design meteorological conditions, dn$ khtendnyerfl O b foVide 2 hscr}$Nn_ of N2 2/krn5[M
/MP.BnS Oh hur"MiShing RAI 410-21 akey weer h lee cookyker m Me eunt of fanselK45e)<s
SB 1 6,.2 Amendment 46 FSAR August 1982 c.
Tower Makeup Water Sufficient tower makeup water is stored in the towe sin for seven sys of operation during accident conditio During this time p d, provisions can be made to trans additional makeup water to site.
If necessary, water e e pumped into the tower basin any one of meny (wit 000') nearby Brown's g
River or Hampton bor locations.
o diesel-driven portable
/
g pumps along with su lent hoe 0-100' lengths of 4" 1D rubber-l (A
lined polyester flexib and associated couplings) are provided for this purpose. One 2500' of hose are atored in each of the two cooling switc rooms.
Each pump is of the self priming ty id of sufficien acity and head to deliver 300 gpm thron the full 5000' of hose.
f required, and prior to I
seven day pump can be moved to the nea appropriate water 6
l source
'ufficient time is available to contr elicopter service to e a pump should a pumping location with limt ccess be required.
l The dose to station personnel filling the basin after 5 days is 4G minimal.
Direct radiation from the containment is less than 1.x 10-3 mr/hr.
The level of the cloud dose is acceptable, and can be minimized or completely avoided by taking water from sources upwind of the con-tainment or by taking water from the pumphouse.
g sTF ~ l ditional and more convent re
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also' a i
onsite (assuming city water is ailable)
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the unlik'ely-q at the intake tun complst.A y bTocked,
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the pumphouse bay 7 floodo rans.f,crTing to the discharge b
tunnel. Makeup water co a-eTEEIy pumped from the pumphouse I
to the tower basin.
o s are restricted due to a page through tiie lockage of less seismic occurren, 7 days) would satisfy tow'el-equirements than 300 g ter in ac nce with Regulatory Guide 1.27.
A curve o ke-er demand for the cooling tower throughout the 7-30 a iod s shown on Fi ure I
Cooling tower makeup water is required to account for losses of 45 tower coolant due to evaporation, drift losses, and tower blowdown.
Of these, evaporative losses consume the largest portion of the required makeup water, and drif t losses are relatively negligible.
Drift losses of 0.03% of the tower circulating water flow rate have been conservatively assumed for the tower.
Sufficient makeup water is provided in the tower basin to account for this loss.
Evaporative losses from the tower are based on the integrated heat loads listed in Table 9.2-14.
These losses were calculated using q
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9.2-23
l-Amendment 46 SB 1 & 2 FSAR August 1982 4
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analytical methods accounting for both the latent heat of vaporiza-tion of the coolant and sensible heat transfer from the coolant to the air assuming saturated exit air. To assure adequate makeup E
supply, the basin capacity was also calculated using an alternate 4
method which conservatively neglects sensible heat transfer and assumes all of the heat transferred is used to evaporate tower coolant. This assures that sufficient makeup water is availatil,t in the tower basin for seven days of tower operation and that min-imum cooling tower pump submergence requirements' are satisfied ati
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all times.
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- Sufficient towersmake-up water is stored in the tower basin for seven days of operation during accident conditions.
Following the seven day period and cssuming city wster is not availabic,9,rgidof the four service water pumps that cre installed in each plant unit may be uced to transfer make-up water from the purphouse bay ty the cooling tower basin.
In the unlikely event that water at 800F or less is not available from th'e intake tunnel, an event that is only
. f possible if a large scismic disturbance occurs when the tunnel flows are
,'., reversed during heat treatment operations, g,
portable pumping system is used to provide,the ualte-up water. Assuming the in-take tunnel is restricted due to a seismic cheurren'ce, neepage through the tunnel blockage of 300 GPM (af ter 7 days) would satisfy tower'make-up requirements in accordance with Regulatory Citide 1.27.
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The' safety grade service water system can conveniently be used to transfer s
After one of the service water pumps (SWP) pump' house water to the tower basin.
is started the cooling tower pump (CTP), which is operating in parallel with th,alSWP, is tripped., Then, service' vater flows through the primary component cooltra and the diesel generator coolers before it is discharged through the The service water flow rate at the 80 F tempera-s l V towef sprays into the basin.
(b, N ure is syfficiens'to remove the accident condition heat from the coolers.
(
3
' 'I becoines full or thegpbmp house wacer. level reaches minimum, one of the CTPs' 4
tust be returned t service before the SWP is tripped.
Except during the periodic el heat treati'ng, operation, the service water pump house bays are connected
/l' tsap'the $'ntake tunnel transition structure, which at low tide contains 750,000 to-gallonsabcvethy,levelreq'uirc[.hforpumpNPSH.
Sixty-five minutes of service water system pomping on a forty-ope hour interval is required to transfer the pump house water cc the towg bach. With extended tower operation the plant cooling load will 63 rqase, the tower make-up requirements will decrease, and be-cause the 300 GPM ttinna6161eakage will exceed the make-up requirerents, the tower basin will become fin'ed. After basin filling, the time interval between service water make-up cycles can be extended.
In ' addition to the service water pumping system, a portable tower makeup pump is maintained on the site.
It is capable of providing make-up water It consists to the tower basing rom the nearby Browns River or Hampton Harbor; &
f 4-inch ID rubber-lined polyester flexible hose in 50-100 foot lengths,
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Pof that is self prim.-
associated hose couplings and ca. portable diesel-driven pump.
ing within 26 feet of water level. The seven-day period that the tower can into operate. without makeup water provides;Eufficient time to move the pump position,dlay the hose and make the system ready for operation.
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t SERVICE WATER PUMPHOUSE. TUNNEL AND PIPE ROUTING DRAWING LIST A.
SW + CW PUMPHOUSE BAY FSAR Fig. 1.2-46 Plan & Section 1.2-47 Plan Below Grade 1.2-48 Sections, General Arrg't.
PIPE ROUTING SW PUMPHOUSE TO TUNNEL TRANSITION STRUCTURES B.
FSAR Fig. 9.2-1, Sh.1 P&I Diagram (shown schematically only in FSAR. See detailed Routing Plan UE&C Dwg.
9763-F-202500)
C.
TUNNEL STRUCTURES FSAR Fig. 1.2-52 General Plan 1.2-53 Profile 1,2-54 Ocean Intake Structure D.
COOLING TOWER FSAR Fig. 1.2-56 General Arrangement
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