ML20079P099
| ML20079P099 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 02/25/1983 |
| From: | Gallagher J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8303040523 | |
| Download: ML20079P099 (19) | |
Text
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PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O COX 8699 PHIL A DELPHI A. PA.19101 JOSEPH W GALLAGHER (215)841-5003 a t a c imet Peono t se os rami nea se, February 25, 1083 Docket Nos.
50-277 50-278 Mr. Darrell G.
Eisenhut Division of Licensing U.
S.
Nuclear Pequlatorv Commission Washington, D.
P.
20555
Dear Mr. Eisenhut:
.c This letter requests an exemotion from the schedule requirements of 10 CPR 50. 4 R (c) (2) and (c) ( 3), to nermit completion of the fire orotection modifications identified in Dhilado!nhia Electric Comoanv's June 28, 1982 Safe Shutdown Ronort for Peach Bottom Atomic Power Statior., Unit 2 and 3.
This letter will exclain the need for additional relief and nrovide a nronosed modification schedulo.
In addition, you will find attached a revised Section 4 of the Peach Rottom Safe Shutdown Report, Tabulation o' Modifications.
This revision to the modificationc list in included to provide further definition of work to So nerformed.
'ho need for this schedule reli ef is attributable to factore not known whan the. Tune 28, 14R2 9afe Shutdown Ronort wan quhmitted as followq:
1.
Increased denian effort necessary to devel on accentable racowav encanquiation desiqns.
2.
Increased Field time recuired to install encansulation materials.
i 3.
Ava il abi li tv of cuitable materials.
4.
Unanticinated safetv desian nroblems with providino i
a water curtain at elevation 135'.
8303040523 830225 PDR ADOCK 05000277 I
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pop
i Mr. Darroll G.
Eiserhut Pace 2
All of the modifications listed in the Safe Shutdown Report that requiro encansulation of cables within a 3-hour rated barrier will need Fchedule relief.
Prenentiv the NPC has only indicated anoroval of Thermo-lac 330-1 as a 3-hour encaonulation material and, other than standard construction wall s, it in the oniv material marketed that is canable of oroviding this nrotection.
Ne are nianninq to use Thermo-laa for the encansulations.
However, the installation of Thermo-lag material is very labor intensive.
The material is shioned either as a caste material which must he annlied to a dry thickness of 1"
(wet thickness 1 1/2") around a wire mesh screen or as rioid nrefabricated sheets 1/2" thick, which must he cut and fabricated into suitable enclosures on a case hv case basis.
i'h e manufacturer had oriqinally indicated that installation would take only 1 manhour ner foot.
After discussions with the manufacturer, PSI, Inc., and other utilities that have installed the encansulation material, it is estimated that installation will renuire about 14 manhours ner linear # cot of racewav.
There ara a total of 6500 linoar feet of raceway that require j
encansulations.
We currently have exnerimental and practice quantition on site to assist in determinina the best method of annlication in the field.
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1 Most of the Fire Drotection '1odifications are affected hv the nrohloms nosed hv encansulation.
The exact modifications affected and new commitment nronosals are outlined in the naracranhs that follow.
To simolifv referencina the modifications listed in the Safo 9hutdown Ronort, tho modifications were arouned hv common work such as Mod 1024A, Mod 1020n, and Mod 10200.
In this letter, and all future communication, the modifications will be referred to in this j
manner.
The attached list nrovides a key for this conversion.
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Modification 1024A nvolves raceways reouirino j
encansulation onlv (as onnosed to chancinq the routino of the 1
q racewavs, or chanqina ecuioment locations and then encansu' ating) 1 and noses the laraest oroblem (see attached list #or the number of modifications i nvol ved ).
Ar such, we oronose that the schedule be chanced from their nresent dato of March 31, 1483 to Decembor 31,1483.
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Modifications 10249,r,D, which wero nreviousiv scheduled for the next refuelina outamos, are two nart modi f i ca t i ons.
Tho modification involves relocatina couinment and reroutino of cables followpa hv the encanselition of several of these cables.
The first cart must bo nerformed durina an outaae, whilo tha
Mr. Darrell G. Eisenhut Page 3
second part (the encapsulation) can be performed non-outage.
The present commitment requires that the work be completed by the end of the next refueling outages.
We recuest that the first portion be recuired to be complete by the end of the next refueling outage with the encapsulation portion to be completed by December 31, 1983.
In addition, schedule relief is being requested for two other modifications because of material unavailability and unforeseen design problems.
The commitment to perform modification 1029R, adding eight hour battery supplied emergency lights in selected areas, will have to be extended two months to June 1, 1983 because of delays in delivery of inverters.
The commitment to perform modification 1029U, providing a water curtain in the west corridor on 135' elevation, Units 2 and 3, will have to be extended two months to June 1, 1983 because of design problems.
Our design process has taken lonaer than anticipated because of difficulties encountered in routing and supporting the water curtain piping system.
Considering the magnitude of the encapsulation task, and unforeseen problems that can be expected to develop during the modification process, it should be recognized that there are uncertainties associated with establishing any schedule at this time.
However, we are confident that a substantial portion of the encapsulation work will be completed during 1983.
In lieu of a definitive completion schedule, we propose to submit a progress recort every four months to the NRC starting in May, 1983.
The report would identify the status of each modification and update our expected completion date.
A flexible implementation schedule that recognizes the uncertainties and engineering challenges imposed by the safe shutdown modification, is needed to establish the climate essential to performing major revisions to vital safety systems in a proper manner.
Considering the uncertainties associated with any modification, we also propose this approach to all of the remaining fire protection modifications identified in the June 28, 1982 submittal.
The modifications required to meet Appendix R,Section III.G. involve primarily modifications to the electrical control circuitry for the plant's safety systems.
It is essential that the design, selection of material, safety reviews and installation of these modifications be performed in a careful and deliberate manner so as not to adversely impact plant safety.
Recent improvements in the Peach Bottom fire protection program as well as the use of IEEE 383 qualified cables selected for installation in the facility, provides cufficient
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Mr. Darrell G. Eisenhut Page 4
compensatory measures to ensure safe shutdown capability until such time a final design can be implemented.
The improvements include additional suppression systems, and a new early warning detection system in all areas which present an exposure fire hazard to safety related systems. The~new detection systems provide protection for twenty-one additional' areas in each unit,-
and improve the protection in five'other areas.
The new early warning detection system, as well'as the_ improvements in fire protection training, ensure a prompt response to a fire by the fire: brigade to mitigate the extent of damage to safety related equipment.
For these reasons, the requested schedule change is appropriate and will not endanger the health and safety of the public.
Therefore, we request, pursuant.to Section 50.12 of the Commission's regulation, exemption to the implementation schedules identified in 10CPR 50.48, subsections (c) (2) ' and (c) (3), as modified by the exemption granted in correspondence dated May 4, 1982 (M. B. Fairtile, NFC to E. G. Bauer, Jr.
PECO.).
Should you have any questions or require additional information, please_do not hesitate to contact us.
Very truly yours,
~
Attachments cc:
Site Inspection Peach Bottom
Attcchacnt I Page 1 of 8
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'PBAPS Fire Protection Mod Progress Report KOy: 2-EOO means " Unit 2 - End of Next Refueling Outage" Present Proposed Commitment Commitment Mod Description Date Date Mod. No.
Enclose MCC 20D12 in a 2-EOO Same 1029V 3-hour fire barrier in Fire Zone 4B.
Rnroute ZD201024K and 2-EOO 2-EOO or 12/31/83, 1029B ZD201027B then (outage) whichever is last cncapsulate in' Fire-3/31/83 Zonsa 4B and 4C.
(non-outage)
Encapsulate 8 conduits 3/31/83 12/31/83 1029A in. Fire Zone 4B.
Encapsulate many trays 3/31/83 12/31/83 1029A in' Fire Zone 4C.
Reroute ZD201024K then 2-EOO 2-EOO or 12/31/83, 1029B encapsulate in Fire (outage) whichever is last Zones 5E and SG.
3/31/83 (non-outage)
Rsroute control cables 2-EOO 2-EOO or 12/31/83, lO29D for 2A/B/C/D Cl32 (outage) whichever is last panols as required -
3/31/83 than encapsulate in (non-outage)
Firo Zone 5K.
'One tray and 3 conduits 3/31/83 12/31/83 1029A nord to be encapsulated in Fire Zone 12D.
Fix ZA3Ol827A (reroute 3-EOO 3-EOO (outage) 1029B than encapsulate in (outage) 12/31/83 (non-outage)
Firo Zone 12C.
3/31/83 (non-outage)
Encapsulate 1/2 SSA 3/31/83 12/31/83 lO29A raceways in Fire Zone 12C.
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Attrchmsnt I P ga 2 cf 8 Februrty 25, 1983 Present Proposed Commitment-Commitment
~ Mod Description Date Date Mod. No.
Encapsulate ZB301794A, 3/31/83 12/31/83 1029A B in Fire Zones 130 cnd 13G.
R; route control cables 3-EOO 3-EOO (outage) 1029B
-for 3A/B/C/D Cl32 (outage) 12/31/83 (non-outage) p nels as required -
3/31/83 thsn encapsulate in (non-outage)
Fire Zone 13K.
3A/B/C/D Cl32' panels-3-EOO 3-EOO (outage) 1029B reroute as required 12/31/83 (non-outage) in Fire Zone 49.
2A/B/C/D C132 panels-2-EOO 2-EOO or 12/31/83, 1029B reroute as required whichever is last in Fire Zone 51.
Encapsulate cables 3/31/83 12/31/83 1029A ZB201800C, D, ZB202785A, 1788A, B, 1789A, 1814A in Fire Zones 60 and 63.
Encapsulate cables 3/31/83 12/31/83 1029A ZA301018B, C in Fire Zone 62.
Encapsulate cables-3/31/83 12/31/83 1029A ZB3Ol799T, ZB301800C, D and ZA3Ol827A in Fire Zones 65A, B, C and 72D.
Encapsulate six conduits 3/31/83 12/31/83 1029A in Fire Zone 75.
Encapsulate several 4kV 3/31/83 12/31/83 1029A power feeds in Fire Zones 78A, B, E and 114.
Encapsulate conduits 3/31/83 12/31/83 1029A ZA2B1249 and ZC2B1247 in Fire Zone 79.
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Attcch nt I Page 3 of 8 J
February 25, 1983
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Present Proposed-Commitment Commitment Mod Description Date Date Mod. No.
Encapsulate conduits 3/31/83 12/31/83 1029A 2C3B137, ZC3B150 and Junction Box J17 in Fire Zone 80.
Encapsulate several 4kV 3/31/83 12/31/83 1029A conduits in Fire Zone 82.
Encapsulate conduit 3/31/83 12/31/83 1029A ZA3D002 in Fire Zone 117.
Encapsulate ZB3D1802A, 3/31/83 12/31/83 1029A B in Fire Zone 118.
Encapsulate seven 3/31/83 12/31/83 1029A conduits in Fire-Zone 119.
Ralocate battery charger 3-EOO 3-EOO (outage) 1029C thcn encapsulate related 12/31/83 (non-outage) cables in Fire Zone 120.
Encapsulate ZB3 Bill 4A 3/31/83 12/31/83 1029A cnd ZD3DD01E in Fire Zone 120.
Encapsulate cables 3/31/83 12/31/83 1029A ZC3A1702J and OG05H in fire Zones 121 and 123.
Encapsulate ZC3A1506K 3/31/83 12/31/83 1029A and OG03H in Fire Zone 122.
Redesign 2A1706R - then 3-EOO 3-EOO (outage) 1029A encapsulate 2A1706R, (outage) 12/31/83 (non-outage)
ZA2A1506K, and OG03H.
3/31/83 (non-outage)
Redesign 2A1603R - then 3-EOO 3-EOO (outage) 1029D encapsulate same in 12/31/83 (non-outage)
Fire Zone 125.
Attcch22nt I Pcga 4 of 8 February 25, 1983 Present Proposed Commitment Commitment Mod Description Date Date Mod. No.
Ralocate battery charger 2-EOO 2-EOO or 12/31/.83 1029C thnn encapsulate related wnichever is-last.
ccbles in Fire Zone 126.
Encapsulate ZB2BD01E, 3/31/83 12/31/83 1029A ZD2DD01E, ZBOB6143C and ZB2Bil22A in Fire Zone 126.
Encapsulate ZA2B1021A, 3/31/83 12/31/83 1029A j
ZA2B1022A and ZA2A1505A
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in Fire Zone 127.
Encapsulate ZB2D1802A, 3/31/83 12/31/83 1029A B in Fire Zone 128.
Encapsulate ZA2B1249, 3/31/83 12/31/83 1029A ZA2B143 and ZC2B1247 in Fire Zone 130.
Rtdesign, then 3-EOO 3-EOO (outage) 1029D encapsulate cables 12/31/83 (non-outage)
ZA1603J, K, L, 2A1706J, K, L-encapsulate 3A1809J, K, L in Fire Zones 132, 133, 134 End 135 as required.
Encapsulate 1/2 SSA 3/31/83 12/31/83 1029A rcceways in Fire Zone 147.
Reroute safety relief 2-EOO Same 1029B valve cables - then 3-EOO da-energize. General.
Redesign safety relief 2-EOO Pending cable spread-1029B valve circuitry to permit 3-EOO ing room exemption de-energization outside the cable spreading room, General.
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Attsch::nt I Page 5 of 8 February 25, 1983 Present Proposed Commitment Commitment Mod Description Date Date Mod. No.
R; design instrument 2-EOO Pending cable spread-1029A loops for five variables 3-EOO ing room exemption per unit subject to 3-hour separation rsquirement-General.
(As previously committed to in correspondence from S. L. Daltroff to D. G.
Eisenhut, dated January 12, 1983.)
Upgrade penetration seals 3/1/84 Same 1110 to required ratings as-previous'y committed in correspondence from J. W. Gallagher to D. G. Eisenhut, d0ted 10/14/81.
Encapsulate control 3/31/83 Pending cable spread-1029A ccbles for MO2 (3)-10-17 ing room exemption or MO2(3)-10-18 whenever both are within the same zone other than Main Control Room-High Low Pressure Boundary Analysis. (As previously committed to in correspondence from S. L. Daltroff to D. G.
Eisenhut, dated January 12, 1983.)
Change the settings on 3/31/83 Same 1029G the following 4kV circuit breakers:
Unit 2-152-1505, 152-1705, 152-1806; Unit 3-152-1505...
152-1806.
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1 Attcch;Gnt I Page 6 of 8 February 25, 1983 l
Present-Proposed Commitment Commitment Mod Description Date Date Mod. No.
Change the settings on 3/31/83 Same 1029H tha 480V load center
-4 circuit breakers:
Unit 2-1013..
1322; Unit 3-1212 1114.
R2 place the following 2-EOO First refueling 2-1029J, 480V motor control center 3-EOO outage or planned Common-m gnetic-only circuit outage that lasts at 1029K,
breakers with thermal least 60 days, com-3-1029L ncqnetic circuit breakers:
mencing after 1/1/84.
Unit 2-3671... 2851; i
Common-4955, 5055, 6131, Un't 3-3851..
6033.
(As previously committed to in correspondence from S. L. Daltroff to D. G.
Eisenhut, dated January 12, 1983.)
Add new ground overcurrent 2-EOO Same 1029M rolays to the following 4kV circuit breakers:
Unit 2-152-1606 and 152-1709.
Rgplace the existing 2-EOO Same 1029N ground overcurrent relays for the following 4kV circuit breakers:
Unit 2; 152-1606 and 152-1704.
Add fuses to the logic 2-EOO Pending cable spread-1029P circuits to provide proper 3-EOO ing room exemption isolation for purposes of the safe shutdown analysis.
(As previously committed to in correspondence from S. L. Daltroff to D. G.
Eisenhut, dated January 12, 1983.)
Attcch :nt I Paga 7 of 8
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February 25, 1983 l
Present_
Proposed Commitment Commitment Mod Description Date Date Mod. No.
1 Add keylock control 2-EOO 2-EOO 10290 cwitches to 4 RHR pump 3-EOO 3-1st refueling circuit breakers to outage or planned prcvide bypass to outage that lasts at csnocia; e:.1 circuite.
least 60 days, com-(As prev)uusly committed mencing after S/31/83.
to in correspondence from S. L. Daltroff-to D. G.
Eisenhut, dated January 12, 1983.)
A6' eight hour battery 3/31/83 6/1/83 1029R power supply capability to the Emergency Lighting System in the following locations: Main Control Room, Remote Shutdown Panels, Cable Spreading Room (selected locations),
Four Emergency Switchgear Rooms, HPSW Pump bays and the fifth bay in the DG Building. (Possibility exists to increase lighting in DG Building using DG supplied sources that will not be subjected to potential fire damage.
Eight hour capability will exist.)
Provide a water curtain 3/31/83 6/1/83 10290 in the west corridors of reactor building, elev.
135; Units 2 and 3.
Isolate the corridor 3/31/83 Same 1029S b hind the emergency switchgear rooms.
l AttCch; Int I Page 8 of 8 February 25, 1983 Present Proposed Commitment Commitment Mod' Description Date Date Mod. No.
Previde dikes for 3/31/83 Same 1029T Emergency Load-Centers on elevation
.165, Units 2 and 3.
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ATTACHMENT.II SECTION 6 Tabulation of Modifications 1)
Modifications identified in the Safe Shutdown Analysis ZONE LOCATION WOR: TO BE PERFORMED 4B RBCW Room Enclose Motor Control Center 20D12 within a 3-hour barrier, reroute ZD201024K, ZD201027B-then encapsulate Encapsulate some conduits and junction boxes 4C MG Set Room Reroute ZD201027B, ZD2010241-then encapsulate Encaosulate many raceways and junction boxsu SE 2A Core Spray Reroute ZD201024% and then encapsulate as requ.'. red SG Reactor Bldg. 116' Reroute ZD201024% and then encapsulate as required 5H Reactor Bldg. 135' Refer to test (Section 3)
SJ Reactor Bldg. 165' Refer to test (Section 3) 9(
Reactor Bldg. 195' Reroute control cables for 2A/B/C/D Cl32 panels as required, then encapsulate as required 12B RBCW Room One tray and 3 conduits need to be enemosulated 12C MG Set Room Reroute ZA301827A, encapsulate ZA301827A and encapsulate 1/2 SSA raceways and junction boxes 13D 3C Core Soray Encapsulate ZB301794A,B 13G Reactor Bldg. 116' Encapsulate ZB301794A,B 13H Reactor Bldg. 135' Refer to text (Section 3) 13J Reactor Bldg. 165' Refer to text (Section 3) 17(
Reactor Bldg. 195' Reroute control cables for 3A/B/C/D Cl32 panels as required, then encapsulate as required 49 Reactor Bldg. 195' 3A/B/C/D Cl32 panels-reroute as required; encapsulate control cables as required 6-1
ATTACHMENT II Pcga-2 cf.6 ZONE LOCATION WORK TO BE PERFORMED 51 Reactor Bldg. 195' 2A/B/C/D Cl32 panels-reroute as required 60 RCTC Room Encapsulate cables ZB20P.'00C,D, ZB201785A, 1788A,B, 1789A, 1814A 62 HPCI Room Encapsulate cc51es ZA3Q?r18B,C 63 RCIC Room Encaosulate cables ZB301800C,D, ZB302785A, 1788A,B, 1789A, 1814A 65A,B,C Rdwste. Bldg. 116' Encapsulate cables ZB301799T, ZB301800C,D, ZA301827A 72A Rdwste. Bldg. Gen.
Refer to text (Section 3) 72D Rdwste. Bldg. 116' Encapsulate cables ZB301799T, ZB301800C, D, ZA3Ol827A 75 Rdwste. Bldg. 135' Encapsulate seven conduits; encapaulate ZA301827A 78A Turb. Bldg. 91' Encapsulate several 4 kV power feeds and junction boxes within 3-hour rated barriers 78B Turb. Bldg. Gen.
Encapsulate several 4 kV power feeds and junction boxes within 3-hour rated barriers 78E Counting Room Same as 78A,B 78H Cable Spread Room Refer to text -(Section 3) 74 Turb. Bldg. 91' Encapsulate conduits ZA2B1249, ZC2B1247 80 Turb. Bldg. 91' Encapsulate conduits ZC3B150, J17, ZB3B137 82 HP Room Encapsulate several 4kV conduits and one juction box 108 Control Room Refer to text (Section 3) 6-2 L_--
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ATTACHMENT II-Pega 3 cf 6 ZONE LOCATION WOR ( TO BE PERFORMED 114 Turb. Bldg. 116' Same as 78A,B 117 3 B/O Batt.
Encapsulate conduit ZA3D002 and ZA3M416 118 3 A/C Batt.
Encapsulate ZB3D1802A,B 119 3C Swgr. Room Encapsulate seven conduits 120 3A Swgr. Room Relocate battery charger and encapsulate cables ZB3B1119A, ZD3DD01E, ZB3BD01 and cables related to battery charger 121 3D Swgr. Room Encapsulate cables ZC3A1702J, OG05H 122 3B Swgr. Room Encapsulate cables ZC3A1506%, OG03ff 123 2D Swgr. Room Encapsulate cables ZC3A1702J, OG05H 124 2B Swgr. Room Redesign 2A1706R-then encapsulate 2A1706k, 2A1506%,
and OGO3H 125 2C Swgr. Room Redesign ZA1603R-then encapsulate same 126 2A Swgr. Room Relocate battery charger and encarSulate ZB2BD01E, ZD2 DOLE, ZBOB6143C, ZB2B1122A and cables related to battery charger 127 2 B/D Batt.
Encapsulate ZA2B1021A, ZA2B1022A, ZA2A1505A 128 2 A/C Batt.
Encapsulate ZB2D1802A,B 130 Turb. Bldg. 91' Encapsulate ZA2B1249, ZA2B143, MC2B1247 132,133 D iesel Rooms Redesign, then encapsulate cables 2A1603J,4,L, 2A1706 J,K,L -
134,135 encapsulate 3A1809J,R,L 147 Turb. Bldg. 135' Encapsulate 1/2 SSA raceways General Reroute safety relief valve cables and de-energize safety relief valve cables 6-3
ATTACHMENT II Page 4 of 6 General Redesign instrument loops for five variables per unit subject to 3-hour separation requirements General Upgrade penetration seals to required ratings as previously committed in correspondence from'J. W. Gallagher to D. G. Eisenhut dated October 14, 1981 2)
Modifications identified in the High Low Pressure Boundary Analysis Encapsulated control cables for MO2 (3)-10-17 or MO(3)-10-18 whenever both are within the same zone other than Main Control Room.
3)
Modifications identified in the Associated Circuits Analysis Change the settings on the relays of the following 4 kv circuit breakers Unit 2 - 152-1505, 152-1705, 152-1806 Unit 3 - 152-1505, 152-1605, 152-1705, 152-1806, 152-1506, 152-1609, 152-1805 Chanqe the settings on the 480V load center circuit breakers:
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Unit 2 - 1013, 1014, 1021, 1022, 1113, 1121, 1122, 1221, 1222, 1321, 1322 Unit 3 - 1213, 1313, 1013, 1014, 1114, 1113 6-4
ATTACHMENT II
.i Page 5 of 6 Replace the following 480V motor control center magnetic-only circuit breakers with thermal magnetic circuit breakers:
Unit 2 - 3671, 3691, 3602, 3606, 3608, 3785, 3791, 3702, 3703, 5915, 5922, 5931, 5943, 6032, 6033, 6041, 3882, 3893, 3894, 3802,-3922, 3983, 3902, 3904, 2851, 2832, 2841 Common - 4953, 5055, 6131 Unit 3 - 3851, 3882, 3891, 3893, 3802, 3922, 3983, 3902, 3904, 2832, 2841, 2851,.
3602, 3785, 3791, 3703, 5915, 5922, 5931, 5943, 5924, 6032, 6033 Add new ground overcurrent relays to the following 4 kv circuit breakers:
Unit 2 - 152-1609, 152-1709 Replace the existing ground overcurrent relays for the following 4 kv circuit breakers:
Unit 2 - 152-1606, 152-1704 Add fuses to the logic circuits to provide proper isolation for purposes of the safe shutdown analysis Add removable handle switches to 4 RHR pump circuit breakers to provide bypass to associated circuits 6-5
ATTACHMENT'II Page. 6 of 6 4)
Modifications to the Emergency Lighting System Add eight hour battery power supply capability to the following' locations:
Main Control Room Remote Shutdown Panels Cable Spreading Room (selected locations)
Four Emergency Switchgear rooms HPSW Pump bays Fifth bay in DG Building Access and egress routes within buildings for the above listed locations 5)
Schedule for completion of modifications Those modifications whose implementation requires plant shutdown will be' performed-at the next refueling outage for each unit currently scheduled for Spring 1983 (Uni t _ 3)
R and Fall 1983 (Unit 2).
Those modifications whose implementation does not require plant shutdown will be performed within nine months on Unit 2 and within nine months or before the end of the Spring 1983 refueling outage (whichever is last) on Unit.3.
This proposed implementation schedule represents our current estimation for completion of the work and may be revised at a later date for reasons beyond our' control such as delays in material delivery or unforeseen technical problems.
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