ML19209B141: Difference between revisions
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{{#Wiki_filter:..OYSTER CREEK NUCLEAR GENERATING STATION PROVISIONAL OPERATING LICENSE DPR-16 (DOCKET NO. 50-219) | {{#Wiki_filter:. . | ||
OYSTER CREEK NUCLEAR GENERATING STATION PROVISIONAL OPERATING LICENSE DPR-16 (DOCKET NO. 50-219) | |||
Applicant hereby requests the Conmission to change Appendix A to the above captioned license as follows: | Applicant hereby requests the Conmission to change Appendix A to the above captioned license as follows: | ||
1.Sections to be changed: | : 1. Sections to be changed: | ||
Section 3.3 2.Extent of Changes: | Section 3.3 | ||
To incorporate the results of a fractun: toughness evaluation which: (i)includes curves for (a)inservice hydrostatic testing (b) non-critical reactor operation, (c) critical reactor operation based upon ten effective full p,ower years of reactor operation;(ii) acccunts for effects of fast neutron fluence calculated for the 1/4T (one quarter of wall thickness) location of the reactor vessel wall.3.Changes requested: | : 2. Extent of Changes: | ||
A.Delete old Figure 3.3.1 and replace with new Figures 3.3.1 B.Delete Specification 3.3. A and replace with the following: | To incorporate the results of a fractun: toughness evaluation which: | ||
A.Pressure Temperature Relationships (i) Ilydrostatic Leakage Tests - the minimum reactor vessel temperature for hydrostatic leakage tests at a given pressure shall be in excess of that indicated by curve A of Figure 3.3.1.(ii) lleatup and Cooldown Operations: | (i) includes curves for (a) inservice hydrostatic testing (b) non-critical reactor operation, (c) critical reactor operation based upon ten effective full p,ower years of reactor operation; (ii) acccunts for effects of fast neutron fluence calculated for the 1/4T (one quarter of wall thickness) location of the reactor vessel wall. | ||
Reactor non-critical--the minimum reactor vessel temperature for heatup and cooldown operations at a given pressure when the reactor is not critical shall be in excess of that indicated by Curve B of Figure 3.3.1 90 7910090 2 h,- | : 3. Changes requested: | ||
A. Delete old Figure 3.3.1 and replace with new Figures 3.3.1 B. Delete Specification 3.3. A and replace with the following: | |||
.(iii)Power operations--The minimum reactor vessel temperature for power operations at a given pressure shall be in excess of that indicated by curve C of Figure 3.3.1.(iv) Appropriate new pressure temperature limits must be approved as part of this Technical Specification when the reactor system has reached ten effective full power years of reactor operation. | A. Pressure Temperature Relationships (i) Ilydrostatic Leakage Tests - the minimum reactor vessel temperature for hydrostatic leakage tests at a given pressure shall be in excess of that indicated by curve A of Figure 3.3.1. | ||
C.Delete Specification 3.3. B and replace with the following: (B)Reactor Vessel Closure Head Boltdown The reactor vessel closure head studs may be elongated by .020" (1/3 design preload) with no restrictions on reactor vessel temperature as long as the reactor vessel is at atmospheric pressure. | (ii) lleatup and Cooldown Operations: Reactor non-critical--the minimum reactor vessel temperature for heatup and cooldown operations at a given pressure when the reactor is not critical shall be in excess of that indicated by Curve B of Figure 3.3.1 | ||
, | |||
11-l7 90 7910090 2 h,-< | |||
. | |||
(iii) Power operations--The minimum reactor vessel temperature for power operations at a given pressure shall be in excess of that indicated by curve C of Figure 3.3.1. | |||
(iv) Appropriate new pressure temperature limits must be approved as part of this Technical Specification when the reactor system has reached ten effective full power years of reactor operation. | |||
C. Delete Specification 3.3. B and replace with the following: | |||
(B) Reactor Vessel Closure Head Boltdown The reactor vessel closure head studs may be elongated by .020" (1/3 design preload) with no restrictions on reactor vessel temperature as long as the reactor vessel is at atmospheric pressure. | |||
Full tensioning of the studs is not permitted unless the temperature of the reactor vessel flange and closure head flange is in excess of 100"F. | Full tensioning of the studs is not permitted unless the temperature of the reactor vessel flange and closure head flange is in excess of 100"F. | ||
D.Delete the second through sixth paragraphs of the bases and replace with the following: | D. Delete the second through sixth paragraphs of the bases and replace with the following: | ||
The Oyster Creek reactor vessel was designed and manufactured in accordance with General Clectric Specification 21 A1105 and ASME Section I as discurseJ in Reference 13. | The Oyster Creek reactor vessel was designed and manufactured in accordance with General Clectric Specification 21 A1105 and ASME Section I as discurseJ in Reference 13. The original operating limitati;ns vere based upon the require-ment that the minimum temperatut e for pressurization be at least 60*F greater than the nil ductility transformation temperature. The minimum temperature for pressurization at any time in life had to account for the toughness properties in the most limiting regions of the reactor vessel, as well as the effects of fast neutron embrittlement. | ||
The original operating limitati;ns vere based upon the require-ment that the minimum temperatut e for pressurization be at least 60*F greater than the nil ductility transformation temperature. | Figures 3.3.1 is derived from an evaluation of the fracture toughness properties performed for Oyster Creek (Reference | ||
The minimum temperature for pressurization at any time in life had to account for the toughness properties in the most limiting regions of the reactor vessel, as well as the effects of fast neutron embrittlement. | : 12) in an effort to establish new operating limits. The results of neutron flux dosimeter analyses in Reference 12 indicate that the total fast neutron fluence ( >l Mov) expected for Oyster Creek at the end of ten effective fuel power years of operation is 1.22 x 10 18 nyt on the inside surface of the reactor vessel core region shell. | ||
Figures 3.3.1 is derived from an evaluation of the fracture toughness properties performed for Oyster Creek (Reference | |||
: 12) in an effort to establish new operating limits. | |||
The results of neutron flux dosimeter analyses in Reference 12 indicate that the total fast neutron fluence ( >l Mov) expected for Oyster Creek at the end of ten effective | |||
A conservative fast neutron fluence of 75% of this value is assumed at the 1/4 T (one quarter of wall thickness) location for the preparation of the pressure /terperature curves in Fi gure 3.3.1. | A conservative fast neutron fluence of 75% of this value is assumed at the 1/4 T (one quarter of wall thickness) location for the preparation of the pressure /terperature curves in Fi gure 3.3.1. | ||
l, 9 99) | l, m 9 99) | ||
..Stud tensioning is considered significant from the standpoint of brittle fracture only when the preload exceed approximately 1/3 of the final design value. | - | ||
. . | |||
Stud tensioning is considered significant from the standpoint of brittle fracture only when the preload exceed approximately 1/3 of the final design value. | |||
No vcFsel or closure stud minimum temperature requirements are considered necessary for preload values below 1/3 of the design preload with t.ie vessel depressurized since preloads below 1/3 of the design preload result in vessel closure and average bolt stresses which are less than 20% of the yield strengths of the vessel and bolting materials. | No vcFsel or closure stud minimum temperature requirements are considered necessary for preload values below 1/3 of the design preload with t.ie vessel depressurized since preloads below 1/3 of the design preload result in vessel closure and average bolt stresses which are less than 20% of the yield strengths of the vessel and bolting materials. | ||
Extensive service experience with these materials has confirmed that the probability of brittle fracture is extremely remote at these low stress levels, irrespective of the metal temperature. | Extensive service experience with these materials has confirmed that the probability of brittle fracture is extremely remote at these low stress levels, irrespective of the metal temperature. | ||
E.References - Pages 3.3-6 Delete references 2,3, and 5 and add References 12 and 13 as follows: (12)Licensing Application Amendment 68, Supplement No. 6, Addendum No. 3 (13)Licensin; Application Amendment 16, Page 1. | E. References - Pages 3.3-6 Delete references 2,3, and 5 and add References 12 and 13 as follows: | ||
4.Discussion: | (12) Licensing Application Amendment 68, Supplement No. 6, Addendum No. 3 (13) Licensin; Application Amendment 16, Page 1. | ||
The existing Oyster Creek temperature / pressure limits for reactor operation do not meet reactor coolant system fracture toughness requirements specified by 10 CFR 50. | : 4. Discussion: | ||
These proposed changes, if apprcved, will eliminate these deficiencies. | The existing Oyster Creek temperature / pressure limits for reactor operation do not meet reactor coolant system fracture toughness requirements specified by 10 CFR 50. These proposed changes, if apprcved, will eliminate these deficiencies. | ||
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(FAHRENHEIT) | |||
P00R~0R gel OYSTER CREEK NUCLEAR GENERATING STATION REACTOR VESSEL PRESSURE / TEMPERATURE LIMITS FOR UP TO TEN EFFECTIVE FULL POWER YEARS OF CORE OPERATION | |||
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. Figure 3.3.1 1 ,.) Q 7 i __ , _3 s}} |
Revision as of 13:51, 19 October 2019
ML19209B141 | |
Person / Time | |
---|---|
Site: | Oyster Creek |
Issue date: | 10/03/1979 |
From: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
To: | |
Shared Package | |
ML19209B138 | List: |
References | |
NUDOCS 7910090222 | |
Download: ML19209B141 (6) | |
Text
{{#Wiki_filter:. . OYSTER CREEK NUCLEAR GENERATING STATION PROVISIONAL OPERATING LICENSE DPR-16 (DOCKET NO. 50-219) Applicant hereby requests the Conmission to change Appendix A to the above captioned license as follows:
- 1. Sections to be changed:
Section 3.3
- 2. Extent of Changes:
To incorporate the results of a fractun: toughness evaluation which: (i) includes curves for (a) inservice hydrostatic testing (b) non-critical reactor operation, (c) critical reactor operation based upon ten effective full p,ower years of reactor operation; (ii) acccunts for effects of fast neutron fluence calculated for the 1/4T (one quarter of wall thickness) location of the reactor vessel wall.
- 3. Changes requested:
A. Delete old Figure 3.3.1 and replace with new Figures 3.3.1 B. Delete Specification 3.3. A and replace with the following: A. Pressure Temperature Relationships (i) Ilydrostatic Leakage Tests - the minimum reactor vessel temperature for hydrostatic leakage tests at a given pressure shall be in excess of that indicated by curve A of Figure 3.3.1. (ii) lleatup and Cooldown Operations: Reactor non-critical--the minimum reactor vessel temperature for heatup and cooldown operations at a given pressure when the reactor is not critical shall be in excess of that indicated by Curve B of Figure 3.3.1
,
11-l7 90 7910090 2 h,-<
. (iii) Power operations--The minimum reactor vessel temperature for power operations at a given pressure shall be in excess of that indicated by curve C of Figure 3.3.1. (iv) Appropriate new pressure temperature limits must be approved as part of this Technical Specification when the reactor system has reached ten effective full power years of reactor operation. C. Delete Specification 3.3. B and replace with the following: (B) Reactor Vessel Closure Head Boltdown The reactor vessel closure head studs may be elongated by .020" (1/3 design preload) with no restrictions on reactor vessel temperature as long as the reactor vessel is at atmospheric pressure. Full tensioning of the studs is not permitted unless the temperature of the reactor vessel flange and closure head flange is in excess of 100"F. D. Delete the second through sixth paragraphs of the bases and replace with the following: The Oyster Creek reactor vessel was designed and manufactured in accordance with General Clectric Specification 21 A1105 and ASME Section I as discurseJ in Reference 13. The original operating limitati;ns vere based upon the require-ment that the minimum temperatut e for pressurization be at least 60*F greater than the nil ductility transformation temperature. The minimum temperature for pressurization at any time in life had to account for the toughness properties in the most limiting regions of the reactor vessel, as well as the effects of fast neutron embrittlement. Figures 3.3.1 is derived from an evaluation of the fracture toughness properties performed for Oyster Creek (Reference
- 12) in an effort to establish new operating limits. The results of neutron flux dosimeter analyses in Reference 12 indicate that the total fast neutron fluence ( >l Mov) expected for Oyster Creek at the end of ten effective fuel power years of operation is 1.22 x 10 18 nyt on the inside surface of the reactor vessel core region shell.
A conservative fast neutron fluence of 75% of this value is assumed at the 1/4 T (one quarter of wall thickness) location for the preparation of the pressure /terperature curves in Fi gure 3.3.1. l, m 9 99)
-
. . Stud tensioning is considered significant from the standpoint of brittle fracture only when the preload exceed approximately 1/3 of the final design value. No vcFsel or closure stud minimum temperature requirements are considered necessary for preload values below 1/3 of the design preload with t.ie vessel depressurized since preloads below 1/3 of the design preload result in vessel closure and average bolt stresses which are less than 20% of the yield strengths of the vessel and bolting materials. Extensive service experience with these materials has confirmed that the probability of brittle fracture is extremely remote at these low stress levels, irrespective of the metal temperature. E. References - Pages 3.3-6 Delete references 2,3, and 5 and add References 12 and 13 as follows: (12) Licensing Application Amendment 68, Supplement No. 6, Addendum No. 3 (13) Licensin; Application Amendment 16, Page 1.
- 4. Discussion:
The existing Oyster Creek temperature / pressure limits for reactor operation do not meet reactor coolant system fracture toughness requirements specified by 10 CFR 50. These proposed changes, if apprcved, will eliminate these deficiencies. 11i2 292
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ll '
" !: M r.IMIT_ TOR POWER-~-
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-j ~ ' OPERATION : ' ~]l,id - bl -- i . iii l '
a i .i . CORE _ CRITICKL)-- J
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. ..ii i e! . COOLDOWNi_AT__ UP _TO_-- * ' ,l**ill -
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,
0 i . I i i 1 0 50 100. 150 200 250 300
, MINIMUM REACTOR VESSEL TEMPERATURE * * .
(FAHRENHEIT) P00R~0R gel OYSTER CREEK NUCLEAR GENERATING STATION REACTOR VESSEL PRESSURE / TEMPERATURE LIMITS FOR UP TO TEN EFFECTIVE FULL POWER YEARS OF CORE OPERATION
' ' . Figure 3.3.1 1 ,.) Q 7 i __ , _3 s}}