ML20203P303
| ML20203P303 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 04/29/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20203P301 | List: |
| References | |
| NUDOCS 8605060549 | |
| Download: ML20203P303 (5) | |
Text
,
SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 1 TO CONSTRUCTION PERMITS NO. CPPR-131, CPPR-132 AND CPPR-133 COMMONWEALTH EDIS0N COMPANY BYRON STATION, UNIT 2 AND BRAIDWOOD STATION, UNITS 1 and 2 DOCKET NOS.: STN 50-455, STN 50-456 AND STN 50-457 INTRODUCTION requested a partial exemption from General Design Criteria (GDC)y, (CECO)
In a letter dated September 17, 1984, Commonwealth Edison Compan 4 of Appendix A to 10 CFR Part 50 for Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2.
By letter dated June 28, 1985, CECO provided a value-impact analysis and requested that a partial exemption to GDC-4 be granted for Jhe first two cycles of operation for the four facilities.
By letter dated August 14, 1985, CECO withdrew, without prejudice, the request for the exemption for Byron Station, Unit 1.
The staff has completed its technical review of the Ceco submittal regarding the application of the " leak-before-break" technology as an alternative to providing protective devices against the dynamic effects resulting from postulated ruptures of the primary coolant loops.
DISCUSSION AND EVALUATION The staff's detailed evaluation and basis for granting the exemption to requirements of GDC 4 are delineated in the schedular Exemption enclosed with the staff's October 28, 1985 letter. The technical evaluation detailed in that Exemption is hereby incorporated into this Safety Evaluation by reference.
The schedular exemption stated that "The Commission hereby approves the limited schedular exemption from GDC 4 of Appendix A to 10 CFR Part 50, to eliminate the requirement to install protective devices, as detailed in Part II of this exemption, associated with postulated pipe breaks of the primary coolant system of Byron Station, Unit 2, and Braidwood Station, Units 1 and 2.
This exemption is effective for periods ending at the completion of the second refueling outage of each of the three facilities, pending the outcome of rulemaking on this subiect.
This amendment does not contain any new technical information; it merely modifies a condition in the Construction Permits to allow the terms of the l
October 28, 1985, exemption to be applied, i
l l
8605060549 860429 j
PDR ADOCK 05000455 l
A PDR l
L
. ENVIRONMENTAL ASSESSMENT Pursuant to 10 CFR 51.32, the Commission has determined that the issuance of the October 28, 1985, schedular Exemption will have no significant impact on the environment (50 FR 43624).
In addition, the staff has determined that-the amendment to the Construction Permit involves no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure. The Commission has detemined that the amendment involves no significant hazards considerations. Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9). Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of this amendment.
CONCLUSION In granting the limited schedular Exemption, the staff found that the advanced fracture mechanics techniques used by the applicant provided an assurance that flaws in primary system piping will be detected before they ;each a size that could lead to unstable crack growth.
For this reason, further protection provided by protective devices against the dynamic effects resulting from the discharge from postulated breaks in the primary piping is unecessary. Additionally, consideration of such dynamic effects associated with previously postu, lated pipe breaks is unnecessary. With full protection against dynamic effects provided by advanced analysis techniques, and based on the considerations discussed above, we conclude that:
(1) the proposed amendment to Construction Permit CPPR-131, CPPR-132, and CPPR-133 permitting the use of the Exemption in construction of Byron Station, Unit 2, and Braidwood Station, Units 1 and 2, does not involve a significant increase in the probability or consequences of accidents previously considered, dces not create the possibility of an accident of a type different from any evaluated previously, does nnt involve a significant decrease in a safety margin, and thus does not involve a significant hazards consideration; (2) there is reasonable assurance that the health and safety of the public will not be endangered by construction and operation in the proposed manner; and (3) such activities will be in compliance with the Commission's regulations, and the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.
Date of Issuance:
APR 2 01986
q
=
m i
2 ENVIRONMENTAL _ ASSESSMENT
- n Pursuant to 10 CFR 51.32, the Commission has determined that the issuance of the October 28, 1985, schedular Exemption will have no significant impact on the environment (50 FR 43624).
In addition, the staff has determined that the amendment to the Construction Permit involves no significant increase in the amounts, and no significant change in.the types, of any effluents that may be released offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure. The Commission has determined that the amendment
~ fnvolves no significant hazards considerations. Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9). Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of this amendment.
CONCf_USION In granting the limited schedular Exemption, the staff found that the advanced fracture mechanics techniques used by the applicant provided an assurance that flaws in primary system piping will be detected before they reach a size that could lead to unstable crack growth.
For this reason, further protection provided by protective devices against the dynamic effects resulting from the discharge from postulated breaks in the primary piping is unecessary. Additionally, consideration of such dynamic effects associated with previously postulated pipe breaks is unnecessary.
With full protection against dynamic effects provided by advanced analysis techniques, and based on the considerations discussed above, we conclude that:
(1) the proposed amendment to Construction Permit CPPR-121, CPPR-132, and CPPR-133 permitting the use of the Exemption in construction of Byron Station, Unit 2, and Braidwood Station, Units 1 and 2, does not involve a significant increase in the probability or cons gences of accidents previously considered, does not create the ptssibility of an accident of a type different from any evaluated previously, does not involve a significant decrease in a safety margin, and thus does not involve a significant ha.ards consideration; (2) there is reasonable assurance that the health and safety of the public will not be endangered by construction and operation in tha proposed manner; and (3) such activities will be in compliance with the Commission's regulations, and the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.
Date of Issuance: APR 2 91986
- See next page for previous concurrences
(/h@I.01shan PDf5*
OEl.D*
DIR:PD#5*
VSNoonan g s4/4/86 4/14/86 4/25/86
~%
ENVIRONMENTAL. ASSESSMENT Pursuant to 10 C 51.32, the Commission has determined that the issuance of the Octobe.' 28, 1
, scheduler Exemption will have no significant impact on the environment (5 43624).
In addition, the staff has determined that the amendment to the Construction Permit involves no signi(icant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant incr, ease in individual or cumulative occupational radiation exposure. The Commission has determined that the amendment involves no significant hazards considerations. Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9). Pursuant to 10 CFR'51.22(b) no environmental impact statement or environmental assessment need be prepared in copnection with the issuance of this amendment.
\\
/
CONCt.USIOM In granting the limited scheduler Exemption, the staff found that the advanced fracture mechanics techniques used by tb6 applicant provided an assurance
. that flaws in primary system piping wjil be detected before they reach a size that could lead to unstable crack growth. For this reason, further protection provided by protective devices against the dynamic effects resulting from the discharge from' postulated breaks in the primary piping is unecessary. Additionally, consiBeration of such dynamic effects associated with previously postulated pipe breaks is unnecessary. With full protection against dynamic effects provided by advanced analysis techniques, and based on the considerations discussed above, we concludesthat:
(1) the proposed amendment to Construction / Permit CPPR-131, CPPR-132, and CPPR-133 permitting the use of the Exemptio/in construction of Byron Station, Unit 2, and Braidwood Station, Unit's 1 and 2, does not involve a significant increase in the probability or consequences of accidents previously considered, does not create the possibil_ity of an accident of a type different from any evaluated previously, does no't involve a significant decrease in a safety margin, and thus does not involve a significant hazards consideration; (2) there is reasonable assurance that the health and safety of the public will not be endangered by construction and operation in the proposed manner; and (3) such activities will be in compliance with the Commission's regulations, and the issuance oi5/ he amendment will not be inimical to the common defense and t
security or to the health and safety of the public.
/
)
Date of Issuance:
- See next page for previous enneurrences OEl.D 8 DIR:PD#
g PD#5 I.01shan VSNoonar 4 /4 /86 4/ 14/86
/ /86 i
i i.-
. ENVIRONMENTAL ASSESSMENT Pursuant to 10 CFR 51.32, the Commission has determined that the issuance of the October 28, 1985, scheduler Exemption will have no significant impact on the environment (50 FR 43624).
In addition, the staff has determined that the amendment to the Construction Permit involves no signifiqant increase in the amounts, and no significant change in the types, of any\\ effluents that may be released offsite, and that there is no significant incr' ease in individual or cumulative' occupational radiation exposure. The ComMssion has determined that the amendment involves no significant hazard's considerations. Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR'51.22(b) no environmental impact statement or environmental assessment need te prepared in connection with the issuance of this amendment.
\\
\\
CONCI.USION In granting the limited scheduler Exemption, the staff found that the advanced fracture mechanics techniques used by the applicant provided an assurance that flaws in primary system riping _will be detected before they reach a size that could lead to unstable crack growth.
Fohthis reason, further protection provided by protective' devices agains.t the dynamic effects resulting from the discharge from postulated bre'aks in the primary piping is unecessary. Additionally, consideration of such dynamic effects associated with previously postulated pipe breaks is unnecessary. With full protection against dynamic effects provided by advanced analysis techniques, and based on the considerations discussed above, ve conclude th'at:
(1) the proposed amendment to Construction Permit CPPR-131, CPPR-132, and CPPR-133 permitting the use of the Exemptio'n in construction of Byron Station, Unit 1, and Braidwood Station, Units 1 and 2, does not involve a significant increase in the probability or consequences of accidents previously considered, does not create the possibi,lity of an accident of a type different from any evaluated previously, does,not involve a significant decrease in a safety margin, and thus does not in'volve a significant hazards consideration; (2) there is reasonable assurance that the health and safety of the public will not be endangered by' construction and operation in the proposed manner; and (3) such
- activities will be in compliance with the Comission's regulations, and the issuance of the amendment will not be inimical to the comon defense and security or to the health and safety of the public.
Date of Issuance:
OEl.D M M DIR:PD#5 PD#5-9
" Vl01sh n i 516IJ VSNoonan 4 /4 /86 V //V 86
/ /86 W\\
reten4n 4e p. t. kek d.
Ecss dt tilsjn