ML022700334: Difference between revisions

From kanterella
Jump to navigation Jump to search
(StriderTol Bot insert)
 
(StriderTol Bot change)
 
Line 2: Line 2:
| number = ML022700334
| number = ML022700334
| issue date = 09/27/2002
| issue date = 09/27/2002
| title = Status of NRC Staff Review of Fenoc'S Bulletin 2001-01 Response for Davis-Besse with Handwritten Notes
| title = Status of NRC Staff Review of FENOCs Bulletin 2001-01 Response for Davis-Besse with Handwritten Notes
| author name =  
| author name =  
| author affiliation = NRC/OCM
| author affiliation = NRC/OCM
Line 19: Line 19:
* Brief for the Commissioners' TAs
* Brief for the Commissioners' TAs
* November 30, 2001
* November 30, 2001
( "!W
( "!W  
                    ,V.. ("
,V..
("


ý & r AGENDA FOR DISCUSSION
ý &
      "* Purpose To discuss the results of the staff's ongoing assessment of FENOC's responses to Bulletin 2001-01 for Davis-Besse To discuss the change in the staff's decision regarding issuance of an Order
r AGENDA FOR DISCUSSION  
      "* Success Commissioners' TAs understand the basis for the staff's decisions regarding responses to Bulletin 2001-01 for Davis-Besse
"* Purpose To discuss the results of the staff's ongoing assessment of FENOC's responses to Bulletin 2001-01 for Davis-Besse To discuss the change in the staff's decision regarding issuance of an Order  
      "* Introduction and discussion of changes - Larry Burkhart (5 minutes)
"* Success Commissioners' TAs understand the basis for the staff's decisions regarding responses to Bulletin 2001-01 for Davis-Besse  
      "* Discussion of status of staff's review - Jack Strosnider and Rich Barrett (15 minutes)
"* Introduction and discussion of changes - Larry Burkhart (5 minutes)  
"* Discussion of status of staff's review - Jack Strosnider and Rich Barrett (15 minutes)


CHANGE IN LICENSEE'S PLANS/COMMITMENTS
CHANGE IN LICENSEE'S PLANS/COMMITMENTS
* The Licensee proposed changing its commitments to include Commencing its refueling outage on February 16, 2002, vice March 31,92002, Perform a qualified visual inspection of 100% of the VHP nozzles and undertaking NDE of those nozzles that have indications of cracking, Characterizing any cracks that are identified in VHP nozzles, at a lower RCS hot leg temperature to reduce the head S*Operating temperature effects on crack initiation and growth, Maximizing the availability of the plant's redundant critical safety systems until shutdown, and Providing increased human factors reliability through additional training, personnel, etc.
* The Licensee proposed changing its commitments to include Commencing its refueling outage on February 16, 2002, vice March 31,92002, Perform a qualified visual inspection of 100% of the VHP nozzles and undertaking NDE of those nozzles that have indications of cracking, Characterizing any cracks that are identified in VHP nozzles, S*Operating at a lower RCS hot leg temperature to reduce the head temperature effects on crack initiation and growth, Maximizing the availability of the plant's redundant critical safety systems until shutdown, and Providing increased human factors reliability through additional training, personnel, etc.


RISK ASSESSMENTS*
RISK ASSESSMENTS*
Base Scenario                    Alternate Scenario**
IE Freq. (/ry) j/
IE Freq. (/ry)                                             4.OE-02                                  2.OE-02 j/ CCDP (/ry)                                                 2.7E-03                                  2.OE-03 Delta CDF (/ry)                                                                                       !4E-05o
CCDP (/ry)
                                                                \1E-04 LERF (/ry)                             . . . .. .....        1E -06                                  4E-07,
Delta CDF (/ry)
                                                                        /
LERF (/ry)
Delta CDF (12/31/01 )(/ry)   )t X                            1,4E-5*
Delta CDF (12/31/01 )(/ry)
                                                                  - 05                                  3E-06 Delta CDF (3/31/02)(/ry)                                     4E-05 Delta CDF (2/1-6/02)(/ry)                                                                             8 E-O
Delta CDF (3/31/02)(/ry)
    *Risk numbers are approximate due to the varius*,u rcerainties associated with this issue.
Delta CDF (2/1-6/02)(/ry)
    "**Includes some. credit   for pat insfdectiorls, compens tory ctions to reduce CCDP, and shortened Aýt shortene           raio of operation
Base Scenario 4.OE-02 2.7E-03
)t X

\\1 E-04 1E -06 1,4E-5*
0 5
4E-05 Alternate Scenario**
2.OE-02 2.OE-03
!4E-05o 4E-07,
/
3E-06 8 E-O
*Risk numbers are approximate due to the varius*,u rcerainties associated with this issue.  
"**Includes some. credit for pat insfdectiorls, compens tory ctions to reduce CCDP, and shortened Aýt shortene raio of operation


RISK-INFORMED DECISIONMAKING GUIDELINES RG 1.174 Intended for licensing basis changes (permanent changes)
RISK-INFORMED DECISIONMAKING GUIDELINES RG 1.174 Intended for licensing basis changes (permanent changes)
  - ACDF less than 1E-06/ry: very small changes are allowed with tracking of cumulative inpacts on CDF
ACDF less than 1 E-06/ry: very small changes are allowed with tracking of cumulative inpacts on CDF ACDF between 1 E-06/ry and 1 E-05/ry: small changes are allowed with tracking of cumulative impacts on CDF ACDF>1 E-05/ry are not normally allowed
  - ACDF between 1 E-06/ry and 1E-05/ry: small changes are allowed with tracking of cumulative impacts on CDF
    - ACDF>1 E-05/ry are not normally allowed
* RG 1.182 Intended for managing risk associated with maintenance activities (short-duration)
* RG 1.182 Intended for managing risk associated with maintenance activities (short-duration)
    -  ICDP<1IE-06 and ILERP 1 E-07: normal work controls apply
ICDP<1IE-06 and ILERP 1 E-07: normal work controls apply ICDP between 1 E-06 and 1 E-05 or ILERP between 1 E-07 and 1 E-06 Assess non-quantifiable factors Establish risk management actions ICDP>1 E-05 or ILERP>1 E-06 Configuration should not normally be entered voluntarily
    -  ICDP between 1 E-06 and 1E-05 or ILERP between 1 E-07 and 1 E-06
      - Assess non-quantifiable factors
      - Establish risk management actions
    - ICDP>1 E-05 or ILERP>1 E-06
      - Configuration should not normally be entered voluntarily


Ic - .-
RG 1.174 SAFETY PRINCIPLES  
RG 1.174 SAFETY PRINCIPLES
"* Current Regulations are met It is likely that, if inspections were performed today, the current regulations would not be met (TS requirements and GDC)  
        "* Current Regulations are met It is likely that, if inspections were performed today, the current regulations would not be met (TS requirements and GDC)
"* Defense-in-depth philosophy is maintained It is likely that one of 3 barriers is degraded However, Davis-Besse has a large, dry containment (licensee states that conditional containment failure probability is1.5E-03)
        "* Defense-in-depth philosophy is maintained It is likely that one of 3 barriers is degraded However, Davis-Besse has a large, dry containment (licensee states that conditional containment failure probability is1.5E-03)
* Sufficient safety margins are maintained o It is likely that safety margins are reduced
* Sufficient safety margins are maintained o It is likely that safety margins are reduced
* Only a small increase in CDF results ACDF (assuming operation until 2/16/02 and crediti comp. actions) is approximately 8E-06/ry                         pi.
* Only a small increase in CDF results ACDF (assuming operation until 2/16/02 and crediti is approximately 8E-06/ry pi.
* Baseline CDF is 6.6E- 05/ry (IPE) -6a A             ,
* Baseline CDF is 6.6E- 05/ry (IPE) -6a A comp. actions)
* The basis of risk measurement is monitored using performance measurement strategies o Will not occur until inspection is performed}}
* The basis of risk measurement is monitored using performance measurement strategies o Will not occur until inspection is performed Ic
. -}}

Latest revision as of 15:42, 16 January 2025

Status of NRC Staff Review of FENOCsBulletin 2001-01 Response for Davis-Besse with Handwritten Notes
ML022700334
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 09/27/2002
From:
NRC/OCM
To:
References
BL-01-001, FOIA/PA-2002-0229
Download: ML022700334 (6)
v • d • e


Text

STATUS OF NRC STAFF, REVIEW OF FENOC'S BULLETIN 2001-01 RESPONSE FOR DAVIS-BESSE

  • Brief for the Commissioners' TAs
  • November 30, 2001

( "!W

,V..

("

ý &

r AGENDA FOR DISCUSSION

"* Purpose To discuss the results of the staff's ongoing assessment of FENOC's responses to Bulletin 2001-01 for Davis-Besse To discuss the change in the staff's decision regarding issuance of an Order

"* Success Commissioners' TAs understand the basis for the staff's decisions regarding responses to Bulletin 2001-01 for Davis-Besse

"* Introduction and discussion of changes - Larry Burkhart (5 minutes)

"* Discussion of status of staff's review - Jack Strosnider and Rich Barrett (15 minutes)

CHANGE IN LICENSEE'S PLANS/COMMITMENTS

  • The Licensee proposed changing its commitments to include Commencing its refueling outage on February 16, 2002, vice March 31,92002, Perform a qualified visual inspection of 100% of the VHP nozzles and undertaking NDE of those nozzles that have indications of cracking, Characterizing any cracks that are identified in VHP nozzles, S*Operating at a lower RCS hot leg temperature to reduce the head temperature effects on crack initiation and growth, Maximizing the availability of the plant's redundant critical safety systems until shutdown, and Providing increased human factors reliability through additional training, personnel, etc.

RISK ASSESSMENTS*

IE Freq. (/ry) j/

CCDP (/ry)

Delta CDF (/ry)

LERF (/ry)

Delta CDF (12/31/01 )(/ry)

Delta CDF (3/31/02)(/ry)

Delta CDF (2/1-6/02)(/ry)

Base Scenario 4.OE-02 2.7E-03

)t X



\\1 E-04 1E -06 1,4E-5*

0 5

4E-05 Alternate Scenario**

2.OE-02 2.OE-03

!4E-05o 4E-07,

/

3E-06 8 E-O

  • Risk numbers are approximate due to the varius*,u rcerainties associated with this issue.

"**Includes some. credit for pat insfdectiorls, compens tory ctions to reduce CCDP, and shortened Aýt shortene raio of operation

RISK-INFORMED DECISIONMAKING GUIDELINES RG 1.174 Intended for licensing basis changes (permanent changes)

ACDF less than 1 E-06/ry: very small changes are allowed with tracking of cumulative inpacts on CDF ACDF between 1 E-06/ry and 1 E-05/ry: small changes are allowed with tracking of cumulative impacts on CDF ACDF>1 E-05/ry are not normally allowed

  • RG 1.182 Intended for managing risk associated with maintenance activities (short-duration)

ICDP<1IE-06 and ILERP 1 E-07: normal work controls apply ICDP between 1 E-06 and 1 E-05 or ILERP between 1 E-07 and 1 E-06 Assess non-quantifiable factors Establish risk management actions ICDP>1 E-05 or ILERP>1 E-06 Configuration should not normally be entered voluntarily

RG 1.174 SAFETY PRINCIPLES

"* Current Regulations are met It is likely that, if inspections were performed today, the current regulations would not be met (TS requirements and GDC)

"* Defense-in-depth philosophy is maintained It is likely that one of 3 barriers is degraded However, Davis-Besse has a large, dry containment (licensee states that conditional containment failure probability is1.5E-03)

  • Sufficient safety margins are maintained o It is likely that safety margins are reduced
  • Only a small increase in CDF results ACDF (assuming operation until 2/16/02 and crediti is approximately 8E-06/ry pi.
  • Baseline CDF is 6.6E- 05/ry (IPE) -6a A comp. actions)
  • The basis of risk measurement is monitored using performance measurement strategies o Will not occur until inspection is performed Ic

. -

Retrieved from "https://kanterella.com/w/index.php?title=ML022700334&oldid=5432715"