ML20003H693
| ML20003H693 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/29/1981 |
| From: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-03-04.D, TASK-3-4.D, TASK-RR A01452, A1452, NUDOCS 8105070253 | |
| Download: ML20003H693 (5) | |
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En e @ (h$e Apri'. 29, 1981 De ket No. 50-2h5 g,
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- b Director of Nuclear Reactor Regulation Attn
Mr. Dennis M. Crutchfield, Chief g
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U. S. Nuclear Regulatory Co==ission Washington, D.C.
20555
References:
(1)
D. G. Eisenhut letter to SEP Plant Licensees, dated January 14, 1981.
(2)
W. G. Counsil letter to D. G. Eisenhut, dated February 27, 1981.
Gentlemen:
Millstone Nuclear Power Station, Unit No. 1 SEP Topic 111 k.D, Site Proximity Missiles As part of the redirection of the Syste=atic Evaluation Program, Reference (1),
Northeast Nuclear Energy Company (NNECO) co==itted to develop Safety Assessment Reports (SAR's) for certain SEP topics which would be submitted for Staff review. NNECO detailed this commitment and provided a schedule for suttittal of SAR's in Reference (2).
In accordance with this co==ittent, N'ECO hereby provides the Safety Assessment Report for SEP Topic lil 4.D, Site Proxinity Missiles, which is included as Attachment 1.
We trust the Staff vill appropriately use this information to develop a Safety Evaluation Report for this SEP topic.
Very truly yours, NORTHEAST NUCLEAR ENiRGY COMPANY i f. fs_
?' l' L*nu W. G. Counsil Senior Vice President 9
N O b))()
l Docket No. 50-2h5 Safety Assessment Report SEP Topic lll-h.D, Site Proximity Missiles I.
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Millstone Nuclear Power Station, Unit No.1 SEP Safety Assessment Report Topic CII-4.D - Site Proximity Missiles (Including Aircraft )
1.0 Introduction The objective of this topic is to assure that the integrity of the.
safety-related structures, systems, and components vill not be impaired and that they will perform their safety functions in the event of a' site proximity missile.
2.0 Criteria Standard Review Plan Section 3 51.5 states that :
The plant is considered adequately designed against site proximity missiles if the resulting probability of a missile affecting the safety-related features of the plant is within the guidelines es-tablished in Section II of Standard Review Plan 2.2.3.
Section II of Standard Review Plan 2.2.3 states:
- j The identification of design basis events resulting frcm the presence i
of hazardous materials or activities in the vicinity of the plant is acceptable if the design basis events-include each postulated type of accident for which the expected rate of occurrence of potential ex-posures in excess of the 10CFR Part 100 guidelines is estimated to 4
exceed the NRC Staff objective of approximately 10-I er year.
p Because of the difficulty of assigning accurate numerical values to 1
the expected rate of unprecedented hazards generally considered in this review plan, judgment must be used as to the acceptability of the overall risk presented.
i 3 0 Discussion The potential for hazardous activities in the vicinity of the Millstone site vill.txe addressed under SEP Topic 11-1.C.
An evaluation of nearby industrial, transportation, and military facilities is well documented j
in Section 2.2 of the Millstone Unit 3 PSAR. The following is excerpted j
from this section.
Three significant industrial complexes exist within 10 miles of the Millstone site. These are:
Apnroximate No.
Ny,
Location of Frployees Distance Sector Dow Che=ical Corp.
Ledyard 300 10 Miles NE (general chemicals)
Pricer Corp.
Groton 2,700 5.5 Miles EiE (general chemicals)
Electric Ecat Groton 20,000 5.5 Miles ETE (Division of General Dynamic s-subcarines )
In addition to the subcarine base in Groton and Coast Guard Academy in New Icndon, there is a training headquarters at Carp O'Neil in East Lyne fcr Connecticut Ar=y National Guard units. Carp O'Neil is owned and operated by the Military Department of the State of Connecticut.
It consists of 80 acres en which there are located 70 buildings for varicus purposes.
It is an administrative training center for troops of the Connecticut Ar=y National Guard.
On a full-time basis, besides a a-Cl contingent of post operations personnel, it contains the headquarters for the Connecticut Military Academy, the 7k5th Signal Cc=pany, and an Organicational Paintenance Shop (regional caintenance of vehicles and equipnent).
On a part-time basis, during various weekends frc March through Nove:ber, it is occupied by troop units for administrative training, billeting, and supply functions.
Because of the administrative nature of its occupancy, the ca=p's cpe: ration has nc effect on station operation.
No other military operauiens such as firing ranges, military airfields,
ordinance depots, and ti'sile sites, exist near the site.
There are presently two sull cen=ercial airports within seven miles of the site, New Icndon (Waterford) Airport and Trumbull Airport. No plans are anticipated by the owners of the airports for expansion of airport facilities.
Because of the nature of traffic at New Icndon (Waterford) Airport, no log is maintained on landings and takeoffs. iiovaver, the airport onerator has estimated that approximately 250-3001sndings and takeoffs occur en good flying days. The operator has also indicated that there are no present plans for expansion of runway facilities, nor for accon=cdation of larger aircraft. Trumbull Airport, apprcximately 7 miles east of the site, handles regularly scheduled connercial passenger flights but is iradequate for handling large jets. UNECO has determined that the probability of an aircraft striking safety related structurcs of Millstene Unit No.1 is sufficiently lov that it does not constitute a significant hacard.
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The site is transversed from east to vest by a railroad right-of-way of the Penn Central Company. The mainline tracks are about 1/2 mile fran the Unit 1.
Traffic on the spur of the mainline track which -
extends onto the site is controlled to minimize the possibility of railroad traffic related accidents. A chlorine rail car is periodi-cally delivered to the south end of the site. The location of the car and.the shielding provided by surrounding structures precludes any threat to safety-related components. The adequacy of the control room ventilation system to protect the operators lin the event of a toxic gas release vill be evaluated as part of TMI. Action Plan Item 111.D.3.h, Control Room Habitability.
There are no major gas transnission. lines within 5 miles of the. site.
The nearest low pressure gas distribution line is more than 3 mil _es fran the site and is located at the corner of Clark Iane and the Boston Post Road -in Waterford. Thuc, gas distribution lines do_not pose a hazard to Millstone Unit 1.
The closest oil transmission line is approximately 5 miles from the site in Groton, Connecticut, and does not pose a Lazard to the site.
4 Associated SEP Topics 11-1.C, Potential Hazards Due to Nearby Industrial, Transportation, and Military Facilities.
h.0 Conclusions Externally generated missiles due to. nearness of airports, tranaportation, industrial, and military facilities, etc., are not postulated for the.
Millstone site. Therefore, no specific protection is_ required other than that described for tornado generated missiles.
Pending resolution of SEP Topic 11-1.C, NNECO concludes that operation of Millstone Unit 1 does not present an undue risk to the health and safety-of the public as a result of aircraft and site proximity missile hazards.
5.0 References 1.
Regulatory Guide 1.91, Evaluation of Explosions Postulated.to occur on Transportation Routes Near Nuclear Power Sites.
2.
Standard Review Plan Sections 2.2.3 Evaluation of Potential 4ecclents 3.5.1.5 Site Proximity Missi. (except aircraft )
3 5.1.6 Aircraft Hazards 3.
D. M. Crutchfield letter to D.-P. Hoffman, dated January 13, 1980.
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