ML20024D135
| ML20024D135 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/29/1983 |
| From: | Bauer E, Bradley E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC |
| Shared Package | |
| ML20024D125 | List: |
| References | |
| NUDOCS 8308030192 | |
| Download: ML20024D135 (9) | |
Text
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BEFORE THE J
UNITED STATES NUCLEAR REGULATORY COMMISSION In the Matter of Docket Nos. 50-277 PHILADELPHIA ELECTRIC COMPANY 50-278 AMENDMENT TO DECEMBER 22, 1977 APPLICATION FOR AMENDMENT OF FACILITY OPERATING LICENSES DPR-44 & DPR-56 Edward G.
Bauer, Jr.
Eugene J. Bradley 2301 Market Street Philadelphia, Pennsylvania 19101 Attorneys for Philadelphia Electric Company 8308030192 830729 PDR ADOCK 05000277 P
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BEFORE THE UNITED STATES NUCLEAR REGULATORY COMMISSION In the Matter of Docket Nos. 50-277 50-27R Pl!TLADELPHIA-ELECTRIC COMPANY AMENDMENT TO DECEMBER 22, 1977 APPLICATION FOR AMENDMENT OF FACILITY OPERATING LICENSES DPR-44 & DPR-56 By application dated December 22, 1977, Philadelphia Electric Company requested an amendment to the Peach Rottom Units 2 and 3 Operating Licenses in response to an NRC request to revise the Peach Bottom Technical Specifications.
The Amendment
'was to provide limiting conditions of operation, surveillance requirements, and bases associated with a modification that would provide a second level of undervoltage protection with a time del'ay for safety-related loads.
Subsequent to the filing, additional information was requested by the Nuclear Requiatory Commission (NRC) staff.
Based on Licensee's responses and subsequent meetings with NRC staff, the December 22, 1977, Application was amended by Licensee on March 21, 1980, to reflect developments and discussions to that time.
Discussions with the NRC staff and clarification of Licensee's proposed design following the filing of the March 1980, Amendment to its application resulted in several further modifications to the design which had been the basis of the March, 1980, submittal.
A Safety Evaluation Report dated February 18, 1982, had been issued by the Office of Nuclear Reactor Regulation accepting Licensee's proposed design for undervoltage protection, which included the modifications proposed subsequent to the filing of the March, 1980, Amendment to its application.
For these reasons, a second Amendment to the December 22, 1977, Application was filed on May 12, 1982.
Further discussions and correspondence dealing with surveillance setpoints and frequency of surveillance requirements following the May 12, 1982 submittal resulted in a revised safety evaluation report being issued by the Office of Nuclear Reactor Regulation on June 14, 1983.
It is now necessary for Licensee to modify its previous Application submittals to conform its proposed Technical i
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Spdcifications to the undervoltage protection design as finally accepted by the NRC Staff.
Accordingly, Philadelphia Electric Company, Licensee under Facility' Operating Licenses GPR-44 and DPR-56, for Peach Bottom Atomic Power Station Units 2& 3 respectively, hereby amends its Application of December 22, 1977 by: (a) withdrawing in its entirety the Amendment of March 21, 1980; (b) withdrawing in its entirety the Amendment of May 12, 1982; and (c) deleting the proposed revised Technical Specification pages 71, 71a, 81, 82 and 93a referred to in the December 22, 1977 Application, and substituting therefor updated pages 71, 71a, 71b, 81, Ria, and 93a, which are attached hereto and incorporated herein by reference; and (d) deleting the first through fifth paragraphs of the December 22, 1977 Application and substituting therefore the following paragraphs:
Philadelphia Electric Company, Licensee under Facility Operating Licenses DPR-44 and DPR-56 for Peach Bottom Atomic Power station Unit Nos. 2 and 3,
respectively,hereby requests that the Technical Specifications incorporated in Appendix " A" of the Operating Licenses be amended by revising Tables 3.2.B and 4.2.B, and Bases 3.2 as indicated by a vertical bar in the margin of the attached pages 71, 71a, 71b, 81, Bla, and 93a.
The changes to Tables 3.2.B and 4.2.B, and Bases 3.2 are proposed to provide limiting conditions of operation, surveillance requirements, and bases associated with a --
modification that provides a second level of undervoltage protection with a time delay for safety related loads.
This system will prevent damage to safety related equipment and controla during periods of sustained degraded voltage at the offsite power sources.
Each of the two offsite power sources will be monitored at each 4KV essential bus by undervoltage relaying.
With a degraded voltage condition at an offsite nource, the undervoltage sensing relays will operate to start a timi ng sequence.
The following relays will be installed on the source side of each startup source to each 4KV essential bus to provide protection under degraded voltage conditions:
(1)
A time delay relay (ITE), actuated at 90% of normal voltage, will trip the startup source breaker after a sixty second time delay.
The time delay is to allow the automatic tap changer on the startup transformers sufficient time to correct the degraded voltage condition.
(2)
A time delay relay (ITE), actuated at 90% of normal voltage, will trip the startup source breaker after a six second time delay if a safety injection signal is present.
This relay, which bypasses the sixty second time delay relay, will limit degraded voltage exposure to six seconds under accident conditions.
The six second time delay is necessary to prevent separation of the emergency buses from the offsite source during motor _
starting transients; yet still be contained within the time envelope in FSAR Table 8.5.1.
(3)
An inverse time delay relay (CV-6), actuated at 87% of normal voltage, will trip the startup source breaker after a time delay of sixty seconds or less depending on voltage conditions.
The inverse time characteristics will provide shorter time delays as voltage degrades.
Two of the degraded grid voltage relays, the existing IAV relay, and the new CV-6 relay are both inverse time relays.
By letter dated July 22, 1982, Licensee committed to surveillance set points for these relays as shown on pages 71a and 71b of the Technical Specifications.
The functional test frequency of the degraded grid voltage relays, as requested by Licensee in letter dated March 14, 1983, was once/6 months.
At that time, Licensee pointed out that, " A requirement for more f requent testing at full power introduces an additional risk of unanticipated transients with little additional benefit."
However, the revised NRC Safety Evaluation issued June 14, 1983, questioned Licensee's relay reliability assessment, concluded that the method used to evaluate the reliability only considered gross failures and
' pointed out that a simple out-of-tolerance could produce unacceptable results.
The Safety Evaluation concluded that Licensee should revise the Application to reflect a functional.
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testing frequency of once per month for the degraded grid voltage relays.
Additionally, the Safety Evaluation requested that surveillance setpoints for the CV-6 and TAV relays be incorporated into the Technical Specification.
Therefore, to agree with the Model Technical Specification and the NRC's revised Safety Evaluation, the frequency of surveillance testing on page 81a of the Technical Specification has been changed to once per month, and survelliance setpoints have been added on pages 71a and 71b.
Obsolete specifications and footnotes on page 81 (Unit
- 3) have been deleted since the modifications authorized by Amendment #67 are complete.
The proposed changes to the Technical Specifications constitute additional limitations and controls governing the operability and surveillance requirements for the degraded grid voltage protection system, and complies with the NRC's acceptance criteria provided in the June, 1983, Safety Evaluation previously referenced.
Consequently, Licensee has concluded, in accordance with NRC Guidance (48 P.R.
14870) and the provisions of Section 50.92 of the Commission's Regulations, that these changes do not involve a significant hazards consideration.
The plant Operating Review Committee and the Operation and Safety Review Committee have reviewed the proposed changes to the Technical Specifications described herein, and have concluded that-they do not involve an unreviesed safety question or a.
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1 Respectfully submitted, I
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c COMMONWEALTH OF PENNSYLVANIA ss.
COUNTY OF PHILADELPHIA S. L. Daltroff, being first duly sworn, deposes and says:
That he is Vice President of Philadelphia Electric Company, the Applicant herein; that he has read the foregoing Amendment to December 22, 1977 Application for Amendment of Facility Operating Licenses and knows the contents thereof; and that the statements and matters set forth therein are true and correct to the best of his knowledge, information and belief.
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F Subscribed and sworn to before me this N day
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. PATRICIA D. SCHOLE Notary Public, Philadelphia, PMahlreis Co.
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