ML20236Y502
| ML20236Y502 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/04/1987 |
| From: | Mroczka E NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML20236Y504 | List: |
| References | |
| RTR-REGGD-01.078, RTR-REGGD-01.095, RTR-REGGD-1.078, RTR-REGGD-1.095 B12738, NUDOCS 8712140041 | |
| Download: ML20236Y502 (4) | |
Text
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NORTHEAST UTILITIES cenerei Omces. seiaen street. seriin. connecticut 1
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(203) 665-5000 December 4,1987 Docket No. 50-423 B12738 Re: 10CF R50.90 U.S. Nuclear Regulatory Commission i
A ttn: Document Control Desk Washington, D.C. 20555 Gentlemen:
Millstone Nuclear Power Station, Unit No. 3 Proposed Revision to Technical Specifications EliminaCon of Control Building Ventilation Chlorine Detectors Pursuant to 10CFR50.90, Northeast Nuclear Energy Compt.ny (NNECO) hereby proposes to amend its operating license, NPF-49, by incorporating the changes identified in Attachment 1 into the Technical Specifications of Millstone Unit No.3.
j The changes will remove the number, setpoint, delay time, and surveillance requirement from Specification 3/4.3.2 for the chlorine detection system.
Millstone Unit Nos.1, 2, and 3 have completed design changes which modified the chlorination systems at each plant. Sodium hypochlorite solution is now used instead of gaseous chlorine. This has resulted in the elimination of on-site bulk storage of liquid chlorine and has eliminated the possib:lity of an on-site chlorine release.
Discussion Regulatory Guide 1.95 is concerned with the habitability of the control room given an on-site chlorine release. Regulatory Guide 1.78 is concerned with the habitability of the control room given a hazardous chemical release outside of the site boundaries.
Chlorine rail traffic on the Amtrack right-of-way through Northeast Utilities property was a concern because of the close proximity to Millstone Unit No. 3 (1700 feet) and the large quantity of chlorine contaiaed in a rail tank car (typically 55 tons). To address this concern, Northeast Utilities (NU) contracted Providence and Worcester Railroad (P&W) to perform a Millstone Nuclear Power Station chlorine rail traffic study. The results of this study indicated that there was no chlorine rail traffic on this right-of-way in 1986 and for the years 1983 through 1985 the average chlorine rail traffic was 2 carloads per year.
Regulatory Guide 1,78 specifies that only frequently shipped hazardous chemicals need to be addressed in the plant design. Frequent shipments are defined in Regulatory Guide 1.78 as exceeding 10 per year for truck shipments, 30 per year for rail shipments, and 50 per year for barge shipments. U ing the
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U.S. Nuclear Regulatory Commission B12738/Page 2 December 4,1987 Millstone Unit No. 3 FSAR, NNECO has determined that shipments of liquid i
chlorine by barge or truck will have no adverse impact on the safety of Millstone 4
Station, due to the decreasing use of Long Island Sound as a shipping channel and the 4 mile distance of the nearest interstate highway from the site.
Based upon the data obtained for the years 1983-1985, NNECO does not anticipate any increase in the chlorine rail traffic in the vicinity of the Millstone f
Station.
However, in order to monitor any future changes, NNECO has contracted with P&W to provide NU with annual updatr;s to the Millstone Nuclear Power Station Chlorine Rail Traffic Study through the year 1991.
Regulatory Guide 1.78 is also concerned with the potential effect of chlorine released from an of f-site chlorine bulk storage facility. NU has evaluated this
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possibility and has determined that no hazard exists. The New London Water l
Treatment Facility was identified as a bulk storage facility of chlorine which 3
utilizes 2 ton cylinders and is located 4 miles from Mllistone Unit No. 3.
Based on the small containers utilized and the 4 mile distance, the New London Water Treatment Facility does not represent a credible hazard to the Millstone Unit No. 3 Control Room (as per Regulatory Guide 1.78).
The Pfizer Pharmaceutical Company was also identified as a bulk storage facility of chlorine. This facility utilizes rail tank cars for chlorine storage and is located 5 miles from Millstone Unit No. 3. Regulatory Guide 1.78 states that
" chemicals stored at distances greater than five miles from the f acility need not be considered because if a release occurs at such a distance, atmospheric dispersion will dilute and disperse the incoming plume to such a degree that there should be suf ficient time for the Control Room operators to take appropriate action."
Based on this principle, the Pfizer Pharmaceutical Company ' storage facility was evaluated and determined not to be a hazard to Millstone Unit No. 3.
In summary, based upon the elimination of on-site chlorine bulk storage, verification of low chlorine rail frequency, and the abserre of potentially hazardous off-site chlorine bulk storage facilities, NNECO proposes to eliminate the Millstone Unit No. 3 Technical Specification requirements for Control Building Ventilation System Chlorine Detectors.
Significant Hazards Consideration NNECO has reviewed the proposed changes in accordance with 10CFR50.92 and has concluded that they do not involve a significant hazards consideration in that these changes would not:
1.
Involve a significant increase in the probability or consequences of an accident previously analyzed. The potential for a chlorine release affecting control room habitability no longer exists since the chlorine rail cars have been removed from the Millstone site. Thus, removal of the requirements on the chlorine detection system will not increase the consequences of any event.
U.S. Nuclear Regulatory Commission B12738/Page 3 December 4,1987 2.
Create the possibility of a new or different kind of accident from any previously ane'yzed. Since there are no changes in the way the plant is operated, the potential for an unanalyzed accident i: not created.
No new failure modes are introduced.
3.
Involve a significant reduction in a margin of safety. The revised technical specifications do not have any adverse impact on control room habitability for the following reasons. On-site chlorine bulk storage has been eliminated. The number of chlorine rail, truck, and barge shipments does not exceed the levels discussed in Regulatory Guide 1.78. The credible off-site chlorine bulk storage facilities are at least 5 miles distant from the site. Since the proposed changes also do not affect the consequences of any accident previously analyzed, there is no reduction in the margin of safety.
Moreover, the Commission has provided guidance concerning the application of standards in 10CFR50.92 by providing certain examples (March 6,1986, FR7751) of amendments that are considered not likely to involve a significant hazards consideration. Although the proposed changes herein are not enveloped by a specific example, the proposed changes would not involve a significant increase in the probability or consequences of an accident previously analyzed. As stated earlier, the potcntial for a chlorine release affecting control room habitability no longer exists since the bulk storage of chlorine at the Millstone site has been eliminated, thereby eliminating the possibility of an on-site chlorine release.
1 Based upon the information contained in this submittal and the environmental assessment for Millstone Unit No. 3, there are no significant radiological or nonradiological impacts associated with the proposed action, and the proposed license amendme,nt will not have a significant ef fect on the quality of the human environment.
The Millstone Unit No. 3 Nuclear Review Board has reviewed and approved the attached proposed revisions and has concurred with the above determinations.
In accordance with 10CFR50.91(b), we are providing the State of Connecticut with a copy of this proposed amendment.
Pursuant to the requirements of 10CFR170.12(c), enclosed with this amendment request is the application fee of $150.00.
Very tru!y yours, NORTHEAST NUCLEAR ENERGY COMPANY
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E. 7. Mroc'zka /
Senior Vice President
' U.S. Nuclear Regulatory Commission B12738/Page 4
. December 4,1987 Attachment cc:
Kevin McCarthy l
Director, Radiation Control Unit Department of Environmental Protection Hartford, Connecticut 0(116 W. T. Russell, Region 1 Administrator Pa L. Ferguson, NRC Project Manager, Millstone Unit No. 3 W. 3. Raymond, Senior Resident inspector, Millstone Unit Nos.1,2, and 3 STATE OF CONNECTICUT )
) ss. Berlin COUNTY OF HARTFORD
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Then personally appeared before me E. 3. Mroczka, who being duly sworn, did state that he is Senior Vice President of Northeast Nuclear Energy Company, a Lice.nsee herein, that he is authorized to execute and file the foregoing irdormation in the name and on behalf of the Licensees herein and that the statements contained in said informatinr. are tu.ie and correct to the best of his knowledge and belief.
LAll/1h1)
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Notary Publif My Commission Expires March 31,1988 i
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