ML20087N088
| ML20087N088 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 03/27/1984 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Varga S Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20087N090 | List: |
| References | |
| TAC-10386, NUDOCS 8404030091 | |
| Download: ML20087N088 (15) | |
Text
.
? gg, TarF Telephone (412) 393-6000 Nuclear Division P.O. Box 4 Shippingport. PA 15077-0004 March 27, 1984
./ Director of Nuclear Reactor Regulation
" United States Nuclear Regulatory Commission Attn:
Mr. Steven A. Varga, Chief Operating Reactors Branch No. I Division of Licensing Washington, DC 20555
Reference:
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Request for Additional Information on N-1 Loop Operation Gentlemen:
The following information is being transmitted as a result of a telecon between Duquesne Light with your staff reviewers from the Reactor
'and Auxiliary Systems' Branches on Thursday, March 22, 1984, relative to two-loop operation.
The enclosed copies of our procedures for secondary side Steam Generator wet lay-up conditions, including chemical treatment, are enclosed as Attachment I.
When the S/G pressure reaches 25 psig, a nitrogen blanket would be placed in service.
The nitrogen pressure would be maintained during wet layup at approximately 2 psig minimum.
To place the S/G in wet layup, the S/G would be filled from the condensate storage tank to a minimum of one foot above the tubes.
Secondary side levels could be maintained by feeding via the chemical addition line (see attached flow diagram, Figure 24-1; B/4 coordinates) if makeup to the idle loop was required during operation.
For high-level conditions, excess water could be drained via the SG Blowdown line (see attached flow diagram, Figure 25-1).
Enclosed is a copy of a page from the Technical Manual for our Steam Generators (51 Series) relative to design pressure and temperature limita-tions. The maximum primary-to-secondary pressure differential is 1600 psig at 650*F, and the maximum secondary-to-primary pressure differential is 670 psig at 650*F.
Our present Technical Specifications (3.7.2.1) limits the pressure on each side of the steam generator to 200 psig when the temperature in the primary or secondary is 70*F.
The basis for these limits are to ensure that the pressure induced stresses in the S/G does not exceed the allowable brittle fracture tcughness stress limits on the steam generator.
During operation, the primary temperatures of the idle loop would exceed the 70*F limit, based on Technical Specification 3.6.1.5 which requires containment temperature to be 75*F.
We will provide overpressure protection capability at 200 psig on both primary and secondary side of the S/G for two-loop operation to envelope the concerns of the brittle fracture limits and design steam generator tube dif ferential pressures.
We have requested information from Westinghouse on these limits, but until new limits are determined that justify exceeding the 200 psig setpoint, we will utilize our present Technical Specification limit.
JKTo. lY W,g 8404030091 840327
%k PDR ADOCK 05000334
- 1' b P
r Beavsr Vclley Pow 2r Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Request for Additional Information on N-1 Loop Operation Page 2 We agree that the primary side of the steam generator should be water solid, or, inerted to prevent, or reduce potential corrosion problems in the idle steam generator.
We also agree with the Mechanical Engineering Branch review of the stop valves, in that the valve's design should pre-clude a catastrophic failure and, therefore, the water hammer concern on the steam generator tubes should be eliminated.
Leakage into the isolated loop would be restricted to the existing technical specification limit of 1 GPM unidentified, or 10 GPM identified if this leakage was routed to a point where it could be measured such as the No. 1 Primary Drains Tank.
In addition to the items discussed during the telephone conference, we understand that there are a number of open items that will require additional technical specifications for N-1 operation.
These will include commitments we have made in past correspondence, SER open items, N-1 Loop BIT concentration and AT trip setpoints.
Our Licensing Staff will prepare the requisite submittal following receipt of the N-1 Loop SER so that all open items can be addressed at that time.
We appreciate the past cooperation given by the numerous branches in reviewing N-1 operation and hope that the technical aspects of this issue will be resolved during 1984.
If there are any additional questions, please contact my office.
Very truly yours, J. J. Carey Vice President, Nuclear Attachments cc:
Mr. W. M. Troskoski, Resident Inspector U. S. Nuclear Regulatory Commission Beaver Valley Pouer Station Shippingport, PA 15077 U. S. Nuclear Regulatory Commission c/o Document Management Branch Washington, DC 20555 Director, Safety Evaluation & Centrol Virginia Electric & Power Company P.O. Box 26666 One James River Plaza Richmond, VA 23261
A T TAC R M E m-I
- V.P.S. - 0.M 1.21.4 C.
'J.T LAY;.~P FROM HOT STAN23Y This procedure is par: cf and sequenced by 5:atica Shutdown, Chapter 31.
This precedure describes the cecidewn and we: layup of :he s:eam genera:crs.
Cenditions 1.
The plan is in a he: standby condition with RCS heat being removed and Tavg maintained by :he steam du=p. system in steam prassure =cde.
Instructiens 1.
'4 hen the steam generator pressures rasch 25 psig, place the steam genera:Or ni: regen blanketing system in service with regulator (PCV-GN-101]
se: at 5 psig, by cpening valves (ING-a30, 431, a32].
2.
A: 10 psig steam generator pressure, close the steam genera:cr main. steam trip valves (TV-1MS-101A, 3 and C]
and ncn-return values (NRV-1MS-101A, 3 and C], Benchbcard - Section C.
3.
Isolate traps T20, T21. T22, T47 and T60 (Main S:eam Lines and Steam Supply to turbine driven feed pump) by closing:
a.
(ISD-13] (leave ISD-14 epen).
b.
[1SD-16] (leave ISD-17 open).
c.
(ISD-19] (leave-1SD-20 open).
d.
(ISD-22] (leave ISD-23 open),
e.
(ISD-136] (leave ISD-137 open).
4 Place the Steam Pressure Cen: roller (PC-MS-464] in MANUAL, and reduce cuto.u to nero.
5.
Place both Steam Dump ' Control Interlock Selector switches in OFF.
6.
Steam generator feed may be secured when the steam generators will.no longer require makeup to maintain level above 94% wide range.
l-j 7.
When the nitrogen regulator-(PCV-1GN-101] is observed to function properly as steam pressure is reduced below 3 psig, its s etting
.may be reduced to 3 psig.
CAUTION: Do not allow steam generater pressure to d:cp below 2 psig.
j-ISSUE 2 REVISION 5 f
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3.V.P.S. - 0.M.
1.21.1-C.
'GT IEU? FROM HOT STANDBY (continued)
NOTE:
If, for any reason, 2 psig minimum nit:cgen pressure is not maintained during the 12'fup period, the s:eam generator atmosphere is to be sampled and analy::ed for oxygen centamination.
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-o-A REVISICS 5
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3.V.P.S. - 0.M.
1.21.4
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This precedure describes the s:eps required to place the 1A Steam Genera:c: in ve: layup from dry layup.
The equipment numbers for :he 13 and 1C Steam Generators are shewn in parenthesia er separate columns.
Cenditiens 1.
The steam generator (s) is empty cf water.
It has an iner nitrogen blanket of at leas: 2 psig and is nc:
oxygen contaminated.
2.
The condensate storage rank and main cendenser he:well held i
sufficient water meeting the specifications cf the 3VPS Chemistry Manual to fill the steam generator (s).
NOTE:
Approximately 20,200 gallens per steam genera cr is recuired for filling to a level of two feet above the tubes (73% widerange).
20,000 gallons is required for a level of 95% wide-range.
Refer to Figure No.
21-10 of this chapter for Steam Generater (1A,13,1C) Level VS. gallens.
3.
The wet layup chemicals are ready for si=ultaneous injectica during the filling evolutien.
4 The condensate system is in operatien.
S.
The feedwater system is aligned per Chapter 24, precedure I, Feeding Steam Generators a: Low Pressure.
6.
If the steam genera:cr had been evacuated prior to placing in dry layup, the steam generator level instruments and sensing lines will need refilling.
7.
If plant cenditions permit, a vacuum should be established in the main condenser to de-oxygenate the fill water.
Otherwise, the water shculd be chemically de-exigenated.
8.
The system is in Normal System Arranges *n: except:
i a.
The main steam line trip valves [TV-1MS-101A (3), (C)] and l
nonreturn valves (NRV-lMS-101A, (B), or (C)]
are shut to l
permit a nitrogen blanket on the steam generators.
b.
Traps T20, T21, T22, T27 and Tc0 (Main Steam Lines and Steam supply to turbine driven auxiliary feed pt=p) are isolated to permit a nitrogen blanket en the steam generators.
c.
Nitrogen blanketing supply valve (s) [1NG-430, (131) & (432)]
is open with pressure regulator [?CV-GN-101] se: to maintain 3 psig.
i ISSUI 2 REVISION 5
3.V.P.S. - 0.M.
1.21.4 D.
WET LAKP FROM ORY LAKP (continued) d.
The steam generater is isolated wi:h the following valves shu: and instruments isolated.
la SG 13 SG 1C SG MCV-174-138A MOV-174-138B MOV-174-13SC MOV-174-136A MOV-1TJ-1563 MOV-174-156C IBD-13 13D-14 ISD-13 13D-10 13D-11 ISD-12 13D-1 13D-2 IBD-3 TV-1BD-100A TV-1BD-1002 TV-13D-100C 1MS-23 1MS-24 IMS-25 NRV-1MS-102A NRV-1MS-1023 NRV-1MS-102C
'T-1?i-474 LT-174-484 LT-174-494 LT-174-473 LT-174-485 LT-174-495 LT-174-476 LT-174-486 LT-1TJ-496 LT-1N-477 LT-ITn*-487 LT-1W-497 FT-1MS-474 FT-1MS-484 FT-1MS-494 FT-1MS-473 FT-1MS-485 FT-1MS-495 PT-1MS-474 PT-1MS-484 PT-1MS-494 PT-1MS-475 PT-1MS-485 PT-1MS-495 PT-1MS-476 PT-1MS-486 PT-1MS-496 PT-1MS-101A PT-1MS-1013 PT-1MS-101C PS-1MS-101A PS-1MS-101C PS-1MS-101C Instructions 1.
Restore all valves and instruments listed in condition 8.d to normal system arrangement.
2.
Station an operator at the steam generator nitrogen supply station to control stea= generator pressure during the _ filling operation.
3.
Commence filling the steam generator per Chapter 24,_ procedure I,.
Feeding Steam Generai.or at Low Pressure.
NOTE:
The 2/3 High High Steam Generator Level Signals to c
l
[MOV-1FW-156A, B, and C] will have to be defeated in order to fill the steam generators beyond the high-high level.
4 Simultaneously star adding the layup chemicals per Chapter 32 Water Treating System.
l NOTE:
The chemical injection flow and fill flow should be l
. adjusted so that the chemicals are-continuously mixed with the fill water to assure total mixing of the steam j
generator chemicals.
l l
1 ISSCE 2 REVISION 3 l
i o _.-,
3.V.P.S. - 0.1.
1.21.4 D.
'4ET LAYUP FROM 2RY '_AYUP (cca:inued) 5.
. Maintain steam generator pressure be: ween 3 and 10 psig by venting nitrogen frem the 1A (13, IC) steam genera:or vacuum test cennecticn [1SG-424 (425) (426)].
6.
Till :he steam generater to a level be: ween ene fact abova the tubes (72.5*. wide range) and maximum indicated range.
NOTE:
If a startup is planned for the near fu ure, a minimum level is preferred to minisine the draining required during heatup.
If long term layup is planned, fill to great than er equal to 94*
wide range to enable chemical mixing.
7.
Restore the nitrogen supply s:stien lineup to supply 3 psig regulated nitrogen pressure.
ISSUI 2 RIVISION 5
BVPS-CM CHAPTER 7 CHEMICAL ADDITION Steam Generators - Lav-up Treatment The purpose of this procedure is to describe the addition of hydrazine and a=monia to the [WT-TK-17A,17B and 17C) chemical feed tanks for direct addition to the 1A, 1B and 1C main unit steam generators for lay-up conditions.
Conditions 1.
Hydrazine measuring tank isolation valve to hydrazine feed tank
[1WT-432] is shut.
2.
Chemical feed pu=ps [WT-P-15A, 153 and 15C) are shut down with pump control switches in the STOP position.
3.
Chemical feed tank drain valves [lWT-386, 487 and 488] are shut.
4.
Demineralized water supply valves [lWT-464, 465 and 466] are closed.
5.
All other valving is arranged in normal system arrangement.
6.
Strainers have been installed in pump suction lines.
7.
All chemical feed tanks have been drained and have been flushed clean.
1 S.
The respective steam generator to be treated is not filled in a solid condition.
9.
Ammonium hydroxide is available for direct addition to feed tank.
i 10.
The Shif t Supervisor has been notified of the intended direct addition to the respective steam generator and has given approval.
11.
The hydrazine measuring tank has been filled to contain predetermined l
amount of required hydrazine solution.
NOTE:
For a stes= generator in a solid wet layup condition, this procedure may also be used provided the steam generator is vented.
Instructions - Additica to 1A Main Unit Steam Generator 1.
Check closed hydrazine 173 and 17C chemical feed tank inlet valves
[1WT-459 and 460].
j 2.
Open hydrazine measuring tank outlet isolation valve [1WT-431 and 457]
and 17A chenical feed tank hydrazine inlet valve [l'aT-458).
3.
When prescribed a=ount of hydrazine has been added, close [lWT-431 and 458).
ISSUE 1 7-20 REVISION 6
I BUPS-CM CHAPTER 7 CHEMICAL ADDITION Steam Generators - Lay-up Treatment (continued).
4.
If am= onium hydroxide is to be added to the steam generator it may be manually added to the tanks either at this point or while deciners-lized water is being added in the following steps.
5.
Check closed demineralized water supply line to 17B and 17C chemical feed tanks [lWT-155 and 466].
6.
Open demineralized water supply valve [lWT-464] adding a minimum amount of water to ensure mixing and dilution.
7.
When proper-tank level has been reached, close [1WT-464].
8.
Notify Station Operating Foreman that chemicals are added to the chemical feed tank and are ready to be pumped directly to the LA Steam Generator.
9.
When operations have opened the appropriate valving to permit the pumping of chemicals to the boiler, proceed to Step 10.
10.
Check closed ISB and 15C pump suction valves [lWT-470, 476, 417 and 477].
11.
Open 17A feed tank cutlet valve [1WT-TK-461] and [WT-P-15A] pump suction valves (1WT-475).
12.
Open 15A pump discharge valves [1WT-478 and 483].
13.
Check closed tie valve [lWT-481 and 482].
14.
Turn pump control switch to START to begin pumping chemicals to lA Steam Generator.
15.
When chemical tank solutiot. has reached a low level in (WT-TK-17A]
tank, admit demineralized water supply to tank by opening [1WT-474]
until sufficient water hcs been added to flush chemical addition line to Steam Generator. Close [IVI-464].
16.
When flushing has been completed turn pump to stop and notify the Station Operating Fore =an.
17.
Drain tank by opening chemical feed drain valve [lWT-486]. When tank has been drained close [1WT-486].
18.
Return valving to nor=al system arrangement.
Instructions - Addition to 13 Main Unit Steam Generator 1.
Check closed hydra:ine 17A and 17C chemical f eed tank inlet valves
[lWT-458 and 460].
ISSUE 1 7-21 REVISION 6
i BVPS-CM CHAPTER 7 CHEMICAL ADDITION Steam Generators - Lav-up Treatment (continued) 2.
Open hydrazine measuring tank outlet isolation valves [1WT-431 and 457] and 17B chemical feed tank hydra ine inlet valve [1WT-459).
3.
When predetermined amount of hydrazine has been added close [1WT-431, 457 and 459].
4.
If a=m' onium hydroxide is to be added to the boiler it may be manually added to the tank either now or while desineralized water is being added in the following steps.
5.
Check closed demineralized water supply line' to 17A and 17C chemical feed ranks [1WT-464 and 466).
6.
Open desineralized water supply valve [1WT-465] adding a mini =um amount of water to ensure mixing and dilution.
7.
When proper tank level has been reached close [1WT-465).
S.
Notify Station Operating Fore =an that chemicals are added to the chemical feed tank and are ready to be pumped directly to the 13 Steam Generator.
9.
When operations have opened the appropriate valving to permit the pumping of chemicals to the boiler proceed to Step 10.
10.
Check closed 15A and 153 pump suction valves [1WT-470, 475, 471 and 476].
11.
Open 17C feed tank outlet valve [1WT-TK-463] and [WT-P-15C] pump suction valve [1WT-477].
12.
Open 15C pump discharge valves [1WT-480 and 485].
13.
Check closed tie valve [1WT-481 and 482].
14.
Turn pump control switch to START and to begin pumping chemicals to 1C Steam Generator.
15.
When chemical tank solution has reached a, low level in [WT-TK-17C) tank, admit demineralized water supply to tank by open1ng [1WT-466]
until sufficient water has been added to flush chemical addition line to Steam Generator.
Close [1WT-466).
16.
When flushing has been completed turn pump to stop and notify the Station Operating Foreman.
17.
Drain tank by opening chemical feed drain valve [1WT-488]. When tank has been drained, close [1WT-476].
18.
Return valving to normal system arrangement.
ISSUE 1 7-22 REVISION 6
BVPS-CM C11 APTER 7 CHEMICAL ADDITION Steam Generaters - Lay-up Treatment (continued)
Instructions - Addition to 1C Main Unit Steam Generator 1.
Check closed hydrazine 17A and 17B chemical f eed tank inlet valves
[1WT-458 and 459).
2.
Open hydra:ine ceasuring tank outlet isolation valve [lWT-431 and 457].
3.
When predetermined amount of hydra:ine has been added close [lWT-431, 457 and 460].
4.
If ammonium hydroxide is to be added to the boiler it mcy be manually added to the tank either now or while deminerali:ed water is being added in the following steps.
5.
Check closed demineralized water supply line to 17A and 17B chemical feed tanks [lWT-464 and 465].
6.
Open decineralized water supply valve [1WT-466] adding a cinimum amount of water to ensure mixing and dilution.
7.
When proper tank level has been reached, close (1WT-466].
8.
Notify Station Operating Foreman that chemicals are added to the chemical feed tank and are ready to be pumped directly to the 1C Steam Generator.
9.
When Operations have opened the appropriate valving to permit the pu= ping of chemicals to the boiler proceed to Step 10.
10.
Check closed 15A and 15C pump suction valves [1WT-470, 471 and 477].
11.
Open 17B feed tank outlet valve [lWT-TK-462] and (b7-P-153] pump suction valve [lWT-476].
12.
Open 15B pump discharge valves [1WT-479 and 484].
13.
Check closed tie valve [lWT-481 and 482].
14.
Turn pump control switch to START and to begio pumping chemicals to 1B Steam Generator.
15.
When chemical tank solution has reached a low icvel in [WT-TK-17B]
tank, admit deminerali:ed water supply to tank by opening [lWT-465]
until sufficient water has been added to flush chemical additicn line to Steam Generator.
Close [1WT-465].
16.
When flushing has been completed turn pump to stop and notify the Station Operating Foreman.
7-23 ISSUE 1 6
REVISION
BVPS -CM CHAPTER 7 CHD!ICAL ADDITION Steam Generators - Lav-uo Treatment (cbntinued) 17.
Drain tsnk by opening chemical feed drain valve [1bi-457]. When tank has drained, close (1ki-487).
18.
Return valving to normal system arrangement.
I t
1 I
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L 7-24 ISSUF. 1 REVISION 6 l
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/
Paragrs;)h 1.1 SECTION 1 - GEN ER A L INF O R'.1 AT10N
/
/
/h SECTION 1 GENERAL INFORMATION
1.1 INTRODUCTION
\\laximum Pr:=:ry to Se:undary Pre:sure Differentt21-J 0
1600 psig :t 650 F.
The vertical s:esm jener:ter des:r: bed in this Technic 2!
Manual has been de:::ned in 2::Ordan:e with the ASME Maximum Se:end:ry to Primary Pressure Du.4 erec ti:1-Boiler and Pret:ure vessel Code. Se::ica !!!, C:sss A.
670 psig at 653 F.
for use'in 2 :losed :y:!e pressuri:ed li;ht water nu !e:r _
p pcwer plan:, The ste:m generator uses hign temeerature WE!CHTS AND CENTER CF GRAVITY pre::ur::ed water to pr: duce dry sna r,stursted steam
~
to dnve tr.e tu:bme gene:2:ct.
Oistance CC.
from.tt. m Hip temperstate pressur::ed res::or ::clant water O#
- "### "'I" O.-dimn We r-lu passes thrcup the L.. tubes transmit::cg heat throup (Fir.1 1 i the tube walls to tne water and water. steam mix:ure en the se::ndary side ci the steam generator.
Dry (C:!:ulsted) 660.250 29.2 ft.
N.ormal Operstmg 3 01.0_, a,
. S.,,,:.
W2:er at me bettem cime :ecendary s:de is heated and ilows upward throu;h de bundle cf U.:ubes chans:ng Flooced" 1.094,7S3 31.9 i:.
into a water s:esm ruxture. The :.:xture rises to de tcp of the bundle and ps::es trough mots:ure removal 0
.Wster at 70 F.
equipment. The essentially d:y s:e:m is then dire::ed to the tu:bme, while the wate cella:ted by de meisture Hesting Suri: e - $ 1,500 :q. it.
separ: tion system ndxes wid $e inceming feedwater U. Tube's 33S5 - 0.375 in. O.D. x 0.050 sv. wall and flows dowTtward to de bottom of de she!! through an annul:r dowr.:cmer between de shell and wispper.
This water is den introduced u= form.,y :nd r2.m. ally CPERATING CONDITIC.%,, A_4 10M LDAD into de tube bundle for recir:ulation. This flow pat:em
- s illust:s:ed in Figure 21.
P::. mary ade Flow Rate - u..!6 x 10' lb.,ht.
Pnm:ry Side Inle: Tempers:ure - 610.90F.
Pnmary Side Out:e: Temperature - 543.30F.
1.2 GENERAL DATA InmafY Sid8 II:332 ' - IIIU 3:3 F
Max: mum P:: mary Side Pre: ure' Drop - 31.6 pu 9
TABLE 1.1 - Perferrnance Characteristics Heat Transferred - 3.03 x 10 Stuihr.
6 Feedwater Flow Pate - 3.35 x 10 lb.J.:.
Fredwa::: Te=persture - 4250F.
DESIGN PRESSURE AND TEMPERATURE Ste:m Flow Rate - 3.55 x 10e Ib.ihr.
Steam Tempe:stu:e - 516.50F.
Ste:m P:r:sure - 790 ps:s OW" O'#Y' Steam Quality - 99.755 rninimum Pre::ure Tem:'.
HYDROSTATIC TEST PRESSURE Primary Chamber Compenents 2485 psig 650 F.
0 See:ndsry Chamber Components 1035 psig 600 F.
0 p7.f,.,. Sjj, 5, c,.ay. 3;ge 4
P : mary Se cnd:ry Scundary Componen:s (Tubes :nd Ini:::1 3106 pa;i 70 F.
135e ps:g
- TO F.
0 Tu:e Shee:i
/ See P2:2;rsen
.7 icr det:ris.
r a
11 6
l
PLANT SYSTEMS 3/4.7.2 STEAM GENERATOR PRESSURE / TEMPERATURE LIMITATICN LIMITING CONDITION FOR OPERATION 3.7.2.1 The temperatures of both the primary and secondary coolants in the steam generators shall be > 70*F when the pressure of either coolant in the steam generator is > 200 psig.
APPLICABILITY: At all times.
ACTION:
With the requirements of the above specification not satisfied:
a.
Reduce the steam generator pressure of the applicable side to < 200 psig within 30 minutes, and b.
perform'an analysis to determine the effect of the overpres-surization on the structural integrity of the steam generator.
Determine that the steam generator remains acceptable for continued operation prior to increasing its temperatures above 200*F.
SURVEILLANCE REQUIREMENTS 4.7.2.1 The pressure in each side of the steaa.generatoc.-sball~.be determined to be < 200 psig at least once per hour when the temperature of either the primary or secondary coolant in the steam generator is
< 70*F.
l'
~c BEAVER VALLEY - UNIT 1 3/4 7-11 e
8
f PLANT SYSTEMS BASES 3/A.7.2 STEAM GENERATOR PRESSURE / TEMPERATURE t.IMITATIO.'t The limitation on steam generat:r pressure and tamper ture ensures that the pressure induced stresses in the stas generstars ce net exceed
~
the maximum allewable fracture toughness stress limits.
The 1 imitations of 70*F and 200 psig are based on a steam generat:r average im:act values taken at 10*F and are sufficient to prevent brittle fracture.
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