ML20028D987
| ML20028D987 | |
| Person / Time | |
|---|---|
| Site: | LaSalle, 05000000 |
| Issue date: | 02/02/1978 |
| From: | Reed C COMMONWEALTH EDISON CO. |
| To: | Parr O Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20028D960 | List: |
| References | |
| FOIA-82-556 NUDOCS 8301200211 | |
| Download: ML20028D987 (4) | |
Text
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CommonweaRh Edison
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Adasssa glo: Post Offs:e Bom 767
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Pehruary 2, 1978 h Da. A. tb
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Mr. Olan D. Parr, Chief g LL, p, g LDG Light Water Reactors - Brarmh 3 Division of Project Management u 2. 9 )S g.
SPA 4FI U.S. Nucl. tar Reguintory "Cct:::sission F%. C W Scmeoa:im.
Washington, D.C.
20555 J
Subjects LaSailo County Station Units 1 and 2 i
Request for Additional Information Concerning F.:ctension of Construction Per: nits Nnc Docket Nos, 50-373 and 50-374
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Reference (a):
O. D. Parr letter to B. Lee, Jr.
dated October 13, 1977 (b)s R. L. Bolger letter to E. G. Case, dated September 22, 1977 Dear Mr. Parra Reference (a) requested additional inforssation concerning our request (Reference b) for extension of the Lasalle County Station construction Permite CPPR-99,and CPPR-100.
Your two specific requests are addressed below.
(1) The attached bar graph schedule (Figure 1) indicates the interrelation of the various schedule factors which have contributed to the schedule extension request for Unit 41.
The first five iteens resulted in direct delays of the project schedule primarily in the initial phase of structural work.
Item 5, contaimment mechanical changes and related structural revisions were responsibio for delay in the start of mechanical work in the containment and reactor buildingo.
As a result of these delays, the work in these areas became the project critical path.
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50-374 str. Clan D. Perrs
-D-February 2, 1978 A
The next contro111ak echaeole factors were itessa 6 and 7, esisting mespower shortages anS probable future shortages.,
The original project =ahadale was predicateid i
on a fiell asaltiple shift basis.
I.inited menpower availability has restricted the second shift to apprawi==tely 50$ of manpower goals med eliminated all
- tot a skeletosi force on the third shift.
These, :
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;.: _ J shortages isere compounded 1sy the Aacreased v.aanpower 4
]T; f changes steelted la increased desiga requirements and S N'.
AsummAm created by item 3
- The WRC',Critaria and code g.y. ~ ' revisions which not only delayed design, and correspond--
,..U iny constructica wondJr, but also increased the volume of The schedule effect of itcs 3 is b,,.constzteticswork.
indicated me a parallel activity to coata4 -
- machemical changes.
This suflects the condition that during this period both factors overl= W. creati=g delays in -whanical work.
Itsen S in separated into
'two parts to reflect an o.a,+ tod two conth critical path schedule delay required by an va%5 pracperatic=21 toot progrc:a and ccustruction restricticas due to ths
= = adad security requiressants.
p The Unit #2 his extension is a direct effect of the strikes, manpower 12mitations, and Unit 91 sc h 1=
delays.
The Nata affect of strikes are similar to l
that of UttAt 41.
Boweeer, efforts to m4m4=4== Wait #1 delays have resultad la reallocation of Unit #2 maa-
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power to Unit #1 work whenever practical, thus, algaiticent3y increasing the effect of manpower shortages en the, Vasit. 92 oched.Is.
(2) as.a result of combined seismic, essweational (thermal, weight, pressure) and aceident lands (car di W ege, Esca, large stessa beenk) the Im8a11e contata===* was et.
11y redesigned.
Each of the 211owing changes a
roamited la Amerensed easety merw as.
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Added structural steel at the intersecting planes ~,
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- t6e.ro the ta'==
mt a=d centai=ms=t walla rmt, Added structural stool to the riascter poco. tal l
and redesigned pedestar c~-%s.
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stRc Docket Nos. 50-373 -
50-374 3-February.2 1978 per. Olan D Parrs b.'Added' structural stiffensre on inside of suppression
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pool floce to increase the load carrying capacity-froma anfans two (2) psi to unt=s eight (8) psi.
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- e. Added 1=+=ral reinforcing braces between downcamers in the suppeassion pool voluna.
- d. Racesignsd c::inting dryws11 c::ihad::. ants and cdded new embed:nonts to drywell for snore anchor / attachment points an a result of load cc:nbinations referenced above.
- e. Dyncmia 3tPV and piping analyses with revised Icads ~
required additie=1 sumwhavs, hangers and rentraints.
There are no major unreviewed safety questions associated l
with any of these changes becanoe each is being reviewith as part of the LaSau e FSAR.
If you have any additional questions wr.rning this matter, please contact *him office.
One (1) signed origtvimi and 39 copies of this letter are provided for your use.
Very truly yours, C1. & J 7
Cox13 ell Reed Assistant Vice President
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Existing Parmit Revised Permit Fuol Load Fuel Load June 1, 1978 March 31,1980
- i Excavation E
- Strikes Up To g
March of '75 Containment Structural manges
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Strikes - March'75 g
e To - Sept 877 l-Structural and
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o Mechanical @anges M
In Con.tainment
. Manpower Shortages pig,p 7773 Future Manpower
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Limitations hs:1agn?J NRC Crlteria, end h
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