DCL-03-109, Supplemental Information to Support License Amendment Request 03-10, Revised Steam Generator Voltage-Based Repair Criteria Probability of Detection Method for Unit 2 Cycle 12.

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Supplemental Information to Support License Amendment Request 03-10, Revised Steam Generator Voltage-Based Repair Criteria Probability of Detection Method for Unit 2 Cycle 12.
ML032651051
Person / Time
Site: Diablo Canyon Pacific Gas & Electric icon.png
Issue date: 09/03/2003
From: Oatley D
Pacific Gas & Electric Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
DCL-03-109, GL-95-005, OL-DPR-82
Download: ML032651051 (25)
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Text

PacificGas and ElectricCompany David H.Oatley Diablo Canyon Power Plant Vice President and P0. Box 56 General Manager Avila Beach, CA 93424 September 3, 2003 805.545.4350 Fax: 805.545.4234 PG&E Letter DCL-03-109 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Docket No. 50-323, OL-DPR-82 Diablo Canyon Unit 2 Supplemental Information to SuDport License Amendment Reauest 03-10. "Revised Steam Generator Voltage-based Repair Criteria Probability of Detection Method for Diablo Canyon Unit 2 Cycle 12"

Dear Commissioners and Staff:

On June 3, 2003, the NRC staff requested information on the characterization of indications detected in steam generator (SG) inspections that would affect PG&E's proposed SG voltage-based probability of detection method, referred to as probability of prior cycle detection (POPCD). Specifically, the NRC requested an assessment of the affect on POPCD with the proposed guideline that bobbin indications, not detected by rotating pancake coil (RPC), be treated as undetected.

PG&E's proposed POPCD was submitted in License Amendment Request (LAR) 03-10 via PG&E letter DCL-03-078, "License Amendment Request 03-10, Revised Steam Generator Voltage-based Repair Criteria Probability of Detection Method for Diablo Canyon Unit 2 Cycle 12,' dated June 26, 2003, and has characterized these types of indications as detected at cycle n. provides PG&E's supplemental information on the NRC requested characterization of indications, and the resulting new NRC POPCD. Independent of the NRC request, Enclosure 1 also provides a revised LAR POPCD to replace the POPCD in LAR 03-10, to incorporate necessary changes based on a further review of the Diablo Canyon Units I and 2 inspection data. An assessment of the affects of these changes is provided in Enclosure 1.

PG&E concludes that the new NRC POPCD results in a slightly less conservative probability of burst for the limiting SG 2-4 in Unit 2 Cycle 12, compared to the revised LAR POPCD. The differences in leak rates between the two POPCD methods are insignificant. Therefore, PG&E recommends that bobbin indications, not detected by RPC, should be treated as detected, and that Unit 2 Cycle 12 Monte Carlo analysis be based on the revised LAR POPCD. This approach is also consistent with the Generic Letter 95-05 requirement that bobbin indications not A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

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-Aoo(

Document Control Desk PG&E Letter DCL-03-109 September 3, 2003

'1anl Page 2 detected by RPC are to be included in the operational assessment as detected indications.

The additional information does not affect the results of the safety evaluation or no significant hazards consideration determination previously transmitted in PG&E letter DCL-03-078.

If you have any questions regarding this response, please contact Stan Ketelsen at 805-545-4720.

Sincerely, David H. Oatley Vice President and General Manager - Diablo Canyon kjs/4328 Enclosures cc: Edgar Bailey, DHS Thomas P. Gwynn David L. ProuIx Diablo Distribution cc/enc: Girija S. Shukla A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

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PG&E Letter DCL-03-109 UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION

) Docket No. 50-323 In the Matter of ) Facility Operating License PACIFIC GAS AND ELECTRIC COMPANY) No. DPR-82

)

Diablo Canyon Power Plant )

Unit2 )

AFFIDAVIT David H. Oatley, of lawful age, first being duly sworn upon oath states that he is Vice President and General Manager - Diablo Canyon of Pacific Gas and Electric Company; that he has executed this supplemental information to support License Amendment Request 03-10 on behalf of said company with full power and authority to do so; that he is familiar with the content thereof; and that the facts stated therein are true and correct to the best of his knowledge, information, and belief.

David H. Oatley Vice President and General Manager - Diablo Canyon Subscribed and sworn to before me this 3rd day of September 2003.

Notary Public / / .

County of SanLuis~a B CH=MsfA~WU Cornmbsson # 1397547 State of California m Noy NtWc - cOin

' Ul~ommEx" Fab 1.2W

Enclosure 1 PG&E Letter DCL-03-109 Supplemental Information on Characterization of Steam Generator Indications Regarding License Amendment Request 03-10, "Revised Steam Generator Voltage-based Repair Criteria Probability of Detection Method for Diablo Canyon Unit 2 Cycle 12" Response to NRC Questions Received on June 3. 2003 NRC Question I Steam generator (SG) indications that at end of cycle n (EOCn) were bobbin detected and rotating pancake coil (RPC) no detectable degradation (NDD), and that at end of cycle n+1 (EOCn+1) were bobbin detected and RPC not inspected, should be treated as undetected.

PG&E Response The Diablo Canyon Power Plant (DCPP) probability of prior cycle detection (POPCD) data is contained in Table 2 of PG&E license amendment request (LAR) letter DCL-03-078, 'License Amendment Request 03-10, Revised Steam Generator Voltage-based Repair Criteria Probability of Detection Method for Diablo Canyon Unit 2 Cycle 12," dated June 26, 2003. The POPCD data in Table 2 of DCL-03-078 was used to determine the POPCD distribution contained in Figure 2 of DCL-03-078. Table 2 in DCL-03-078 considered these flaws as detected at EOCn based on the bobbin call at EOCn-Table 2 of this enclosure provides the new NRC POPCD data to treat an indication, that at EOCn was RPC NDD and that at EOCn+1 was RPC not inspected, as undetected (new indication) because it was RPC NDD at the prior inspection.

NRC Question 2 Indications that at EOCn were bobbin detected and RPC NDD, and that at EOCn+1 were bobbin detected and RPC detected, should be treated as undetected.

PG&E Response Table 2 in DCL-03-078 considered these flaws as detected at EOCn based on the bobbin call at EOCn. Table 2 of this enclosure provides the new NRC POPCD data to treat an indication, that at EOCn was RPC NDD and at EOCn+1 was RPC detected, as undetected (new indication) because it was RPC NDD at the prior inspection.

NRC Questions 3 Indications that at EOCn were bobbin detected and RPC NDD, and at EOCn+1 were bobbin NDD and RPC confirmed, should be treated as undetected.

I

Enclosure I PG&E Letter DCL-03-109 PG&E Response The databases were reviewed and there are no occurrences of this combination.

Therefore, this NRC guideline does not affect Table 2 of this enclosure. Any indications, that at EOCn were bobbin detected and RPC NDD, and at EOCn+, were bobbin NDD and RPC confirmed, that occur in the future will be classified as axial outside diameter stress corrosion cracking (ODSCC) not detected by bobbin (AONDB) at EOCnj and included as a new indication independent of the call at EOCn.

NRC Question 4 If an indication is RPC confirmed at EOCn, then RPC of the indication at EOCn+1 should be required.

PG&E Response For indications which are AONDB at EOCn and bobbin NDD at EOCn+1, PG&E will perform RPC inspection of these indications at EOCn+1, to ensure that all known ODSCC indications are included in the Monte Carlo calculations.

For all other EOCn RPC indications, PG&E disagrees with the NRC recommendation since it may require thousands of unneeded RPC inspections. PG&E may elect to perform RPC of bobbin indications at EOCn for various purposes, but that should not dictate that RPC inspection at EOCn+1 is then required. For example, many bobbin indications were RPC inspected in DCPP Unit 2 Refueling Outage 11 (100 percent of bobbin indications in SG 2-1 and 100 percent of greater than I volt bobbin indications in SGs 2-2, 2-3, and 2-4) to identify and characterize any high voltage RPC indications that may be returned to service for DCPP -Unit 2 cycle 12. These indications are not required to be RPC inspected again in DCPP Unit 2 Refueling Outage 12 unless they meet Generic Letter (GL) 95-05 or plant specific criteria at that time.

NRC Question 5 For indications at EOCn that were bobbin detected and RPC confirmed, and at EOCn. 1 were bobbin detected and RPC NDD, provide an explanation for the disappearing flaw.

PG&E Response There was only one case of this occurrence in all DCPP alternate repair criteria inspections to date. In DCPP Unit I Refueling Outage 9 (1R9), an ODSCC signal was detected by bobbin and Plus Point coils in SG 1-2 row 29 column 61 (0.8 volt dent). In Unit 1 Refueling Outage 10 (1R10), bobbin coil detected ODSCC, but Plus Point coil did not. In Unit 1 Refueling Outage I1 (1R1 1), both bobbin and Plus Point coils detected ODSCC. A second review of the bobbin and Plus Point data in these inspections was performed to determine why the Plus Point coil detected a flaw in 1R9 and 1R11 but not in IR10.

2

Enclosure I PG&E Letter DCL-03-109 The bobbin coil signals did not change from outage to outage. In 1R9, a bobbin call was made although the bobbin signal was not like a typical ODSCC signal. The Plus Point coil data showed small signals in each outage (about 0.1 volts), but the signals were not flaw like (signal rotates out), and the signals could be attributed to deposits.

Thus, the Plus Point calls were very conservative in I R9 and I RI1, and could have been called as NDD. Likewise, the 1R9, 1RI0, and IRI1 bobbin call could have been NDD as well. Similar low voltage, marginal signals can be expected to be called as a flaw or NDD in the future based on nondestructive examination (NDE) analyst judgment.

NRC Question 6 For indications that at EOCn were bobbin detected and RPC confirmed, and at EOCn+1 were bobbin NDD and RPC NDD, provide an explanation for the disappearing flaw.

PG&E Resnonse There was only one case of this occurrence in all DCPP alternate repair criteria inspections to date. In DCPP 1R9, an ODSCC indication was reported by bobbin and RPC in SG 1-2 row 6 column 69 (0.8 volt dent). In 1RI0, both bobbin and RPC were NDD. In 1RI1,bobbin was NDD and RPC inspection was not performed. A second review of the bobbin coil and Plus Point coil data in these inspections was performed to determine why the Plus Point coil detected a flaw in I R9 but not in 1RI0.

The bobbin coil signals did not change from outage to outage. In 1R9, a bobbin call was made although the bobbin signal was not like a typical ODSCC signal. The Plus Point data showed small signals in each outage (about 0.1 volts), but were not flaw like (signal rotates out), and the signals could be attributed to deposits. Thus, the Plus Point coil signal call was very conservative in 1R9, and could have been called as NDD.

Likewise, the I R9 bobbin call could have been NDD as well. Similar low voltage, marginal signals can be expected to be called as a flaw or NDD in the future based on NDE analyst judgment.

NRC Question 7 For indications that at EOCn were bobbin NDD and RPC confirmed, and at EOCn+1 were bobbin detected and RPC NDD, provide an explanation for the disappearing flaw.

PG&E Resoonse The databases were reviewed and there are no occurrences of this combination.

Therefore, no assessment is required.

3

Enclosure I PG&E Letter DCL-03-109 Discussion of Changes in POPCD Data PG&E has made two sequential changes to the POPCD data contained in LAR 03-10.

These are described below.

Revised LAR POPCD The LAR POPCD data in Table 2 of PG&E letter DCL-03-078 has been revised to reflect necessary changes as a result of further review of DCPP inspection data. The updated data is termed "Revised LAR POPCD." Table 1 of this enclosure provides the Revised LAR POPCD data table, and replaces Table 2 of PG&E letter DCL-03-078.

The reasons for the most significant changes are summarized below:

  • Column K was added in Table 1. This column accounts for indications that were found only by RPC inspection at EOCn and were plugged at EOCn. Since these intersections have confirmed ODSCC with no bobbin detection, they should be considered as 'misses' at EOC,. Previous versions of POPCD did not account for these indications. The formula in column N for 'New EOCn+1 ODSCC Indications' was also updated to include column K.
  • All cases of a distorted inner diameter (ID)support signal indications at EOCn were considered as bobbin detected at EOCn unless confirmed by Plus Point to be a primary water stress corrosion cracking indication. A distorted ID support signal (DIS) indication is a bobbin call with an ID phase angle at a dented intersection that requires a follow-up Plus Point inspection. Outside diameter flaws sometimes have ID phase angles, which can also be enhanced by the influence of a dent. During the further review of the POPCD data, inconsistencies were noted in how indications were treated inTable 2 in DCL-03-078. In some cases, the previous DIS indications were treated as a detection, and in other cases they were treated as no detection.

For the Revised LAR POPCD data Table 1,the appropriate column for the EOCn DIS indications is dependent upon the bobbin and RPC calls at EOCn+1. A few indications moved from column G to either column B or column C.

  • Incases where an indication was called a DIS at EOCn, and at EOCn+1 was called by bobbin and confirmed by Plus Point as ODSCC, the voltage at EOCn+1 was obtained by using the Plus Point-to-bobbin voltage correlation if the indication was confirmed as ODSCC at EOCn+1. This was done because the bobbin voltage is not considered reliable at either EOCn or EOCn+1 since it can be influenced by the dents or noise at these intersections. The voltage at EOCn was then estimated by subtracting the average growth for that particular cycle of operation.
  • Column D of Table 1 increased by 20 indications from that contained in Table 2 in DCL-03-078. Table 2 in DCL-03-078 only included indications that were detected with bobbin, confirmed with RPC, and plugged at EOCn, to be consistent with the previously published POPCD results for the industry. Table I adds indications that 4

Enclosure 1 PG&E Letter DCL-03-109 were detected with bobbin, not inspected with RPC, and plugged at EOCn. The title to Column D was revised to reflect this change.

  • Column E of Table 1 also increased by 20 indications. This increase is due to the fact that this column now includes indications that were RPC NDD at EOCn and plugged at EOCn. Table 2 in DCL-03-078 only included indications that were detected with bobbin, but not detected with RPC at EOCn+1 .

New NRC POPCD To incorporate the NRC guidelines in questions 1, 2, and 3 above, that is, indications that are bobbin coil detected and RPC NDD at EOCn should be treated as undetected at EOCn, PG&E relocated pertinent data in Table 1 to create Table 2. Table 2 data is termed 'New NRC POPCD," and reflects moving indications from column B and column C to a new column J since they are now being treated as undetected at EOCn.

In addition, Table 5 was created to provide the Table 2 data in a format requested by the NRC on June 3, 2003. Tables 5a, 5b, 5c, and 5d provided data to reflect the number of indications less than or equal to 1.0 volt at EOCn, the number of indications greater than 1.0 volt and less than or equal to 2.0 volt at EOCn, the number of indications greater than 2.0 volt at EOCn, and the total number of indications for all voltages respectively.

Assessment of Revised LAR POPCD and New NRC POPCD The Revised LAR POPCD data in Table 1 becomes the baseline for which POPCD method should be assessed. As such, the affect of the Revised LAR POPCD data in Table 1 has been assessed by PG&E relative to the LAR POPCD data in DCL-03-078.

In addition, the affect of the New NRC POPCD data in Table 2 has been assessed relative to the Revised LAR POPCD data in Table 1.

Table 3 provides the regression parameters for the Table 1 Revised LAR POPCD data, the Table 2 New NRC POPCD data, and the DCL-03-078 LAR POPCD data (repeated from Table 6 in DCL-03-078).

Figure 1 shows the loglogistic fit to the Table 1 Revised LAR POPCD data. The lower 90-percent confidence bound on the POPCD distribution and the fractional probability of detection (POD) data values are also shown for information. The fractional POD values are not used in the general linear model analyses since the POPCD analysis is weighted by the number of detected and undetected indications in each voltage bin.

This figure replaces Figure 2 in DCL-03-078.

Figure 2 compares the loglogistic Revised LAR POPCD curve with the loglogistic LAR POPCD curve (from Figure 2 in DCL-03-078). Compared to the LAR POPCD data, the Revised LAR POPCD data decreases the POD above about 0.5 volt and increases the POD below about 0.5 volt.

5

Enclosure I PG&E Letter DCL-03-109 Figure 3 compares the loglogistic Revised LAR POPCD curve with the loglogistic New NRC POPCD curve. Compared to the Revised LAR POPCD data, the New NRC POPCD data slightly increases the POD above about 1.0 volt and decreases the POD below about 1.0 volt.

Table 4 provides DCPP Unit 2 Cycle 12 Monte Carlo probability of burst (POB) and steam line break (SLB) leak rate operational assessment results using voltage dependent growth and three POPCD curves (LAR POPCD, Revised LAR POPCD, and New NRC POPCD). The Monte Carlo results for the LAR POPCD curve are repeated from Case 5 of the DCPP Unit 2 Refueling Outage 11 90-day report contained in of PG&E letter DCL-03-076, "Special Report 03 Results of Steam Generator Inspections for Diablo Canyon Power Plant Unit 2 Eleventh Refueling Outage" dated June 23, 2003.

The limiting POB based on the Revised LAR POPCD curve is 6.46E-03 for SG 2-4, a 17 percent increase compared to the limiting POB (5.52E-03) from Case 5 of the 90-day report, but still less than the 1E-02 reporting threshold. The POB increase of 0.94E-03 is less than 10 percent of the reporting threshold and is not considered to be a particularly meaningful increase in POB. The limiting leak rate based on the Revised LAR POPCD curve is 2.89 gallons per minute (gpm), an increase of 3 percent compared to the limiting leak rate (2.81 gpm) for Case 5 of the 90-day report.

The limiting POB based on the New NRC POPCD curve is 6.01 E-03, a 7 percent decrease compared to the limiting POB (6.46E-03) for the Revised LAR POPCD curve.

The limiting leak rate based on the New NRC POPCD curve is 2.93 gpm, essentially the same leak rate as the limiting leak rate (2.89 gpm) for the Revised LAR POPCD curve.

In conclusion, the effect of implementing the NRC guideline to treat indications that are bobbin coil detected and RPC NDD at EOCn, as undetected at EOCn, results in a slightly less conservative POB value for the limiting SG 2-4 for Unit 2 Cycle 12. For the other SGs, the results in Table 4 show that the POB differences between the two POPCD methods are small (less than I E-04) and are not meaningful. The Table 4 results also show that leak rate differences between the two POPCD methods are small (less than or equal to 0.04 gpm) and are not meaningful. The increase in POB for SG 2-4 with the Revised LAR POPCD curve is due to the large number of high voltage indications in SG 2-4 for which the revised LAR POD is slightly lower than the NRC POD.

Therefore, PG&E recommends that Unit 2 Cycle 12 Monte Carlo analysis be based on the Revised LAR POPCD data inTable 1 and Figure 1. This recommendation is consistent with the requirements of GL 95-05, which requires that RPC NDD indications be included in the operational assessment as detected indications. Inclusion of the RPC NDD indications in the POPCD data as undetected bobbin indications would effectively further increase the number of RPC NDD indications in the operational assessment due to the decrease in POD for these indications.

6

t Enclosure I PG&E Letter DCL-03-109 Table 1. DCPP Revised LAR POPCD Data (1,6)

Column B C D E F 0 HI I J K L M N 0 New EOC. and E0Cno Bobbin EOC" Bobbin Detected Now EOCm,(Undeece or RPC NDD at EOC6) Ind. fo EO'C,,.

Detected for POPCD Ind. Excluded from POPCD Analysis Excluded POPCD Calculationst Anaiyuis'm EOC POPCD from Bobbin EOC, Ind. POPCD md., RPC ~~~~~~~~~~~~~~~~Found In, P EOC, Onyl~b) by E0C~~~~~~~onfrmNot Bobbin EOCflowRP EO~n WC, or Not nd. RPC Bobbin New EOm New Inpcin NOW Bobbn Id. obbi Ind nspected Nd. RPC In. INR(4) EOC* Bobbi EOC,,. 1 This Column andpcto EOC,,., EOCfl New POPCD Volta at EOC, & at EO~~~~m Bobbi 1 Bob in d. Found PiBobbin Bobbin EOC",, for BIn~r RPC Not RPC Repaired EOn r & Not Ind. RPC RPCNo Only' by Intentionally Pugged at In. RPC Detected 009CC Voltage atnfirmed IeOctd a EECC spectedin RPC Left Empty EOC, NDD at nd. Id. Bin PMugged at at EO."e tEC. pcinEC.

0.1 3 1 0 0 0 23 51 0 0 0 6 4 74 0.051 0.2 33 42 2 5 4 100 389 0 0 1 18 77 490 0.136 0.3 60 191 5 25 9 132 516 29 0 0 27 256 677 0.274 0.4 75 285 17 11 14 104 384 88 0 1 20 377 577 0.395 0.5 68 263 8 15 14 65 199 27 0 3 6 339 294 0.536 0.6 78 197 8 14 4 38 113 11 0 10 7 283 172 0.622 0.7 74 146 4 10 5 27 59 1 0 3 8 224 90 0.713 0.8 52 89 7 5 1 19 37 1 0 0 3 148 57 0.722 0.9 57 68 2 2 2 16 14 0 0 0 1 127 30 0.809 1.0 36 38 1 1 1 4 5 0 0 0 1 75 9 0.893 1.1 35 16 6 0 0 6 6 0 0 0 2 57 12 0.826 1.2 18 22 2 3 0 3 3 0 0 0 2 42 6 0.875 1.3 22 18 0 1 0 2 4 0 0 0 0 40 6 0.870 1.4 27 9 2 1 0 2 1 0 0 0 0 38 3 0.927 1.5 13 7 1 0 0 1 0 0 0 0 0 21 1 0.955 1.6 7 4 1 0 0 0 0 0 0 0 0 12 0 1.000 1.7 10 1 0 0 0 0 0 0 0 0 0 11 0 1.000 1.8 8 1 0 0 0 0 0 0 0 0 0 9 0 1.000 1.9 7 0 0 0 0 0 0 0 0 0 0 7 0 1.000 2.0 10 1 0 0 0 0 0 0 0 0 0 11 0 1.000 7

Enclosure 1v PG&E Letter DCL-03-109 Table 1. DCPP Revised LAR POPCD Data (1,6)

Column B C D E FG H I J K L M N 0 New EOCc and EOCr, Bobbin EOCn Bobbn Dedcted New EOC,,.1 (Undetected or RPC NDD at EOCn) Ind. for EOClu, POPCD Calculatlon")

Analyslsl2H POPCD POPCD Anysis heom Bobbn EOC, mnd. POPCD____

Confirmed obi E0C. NewRP Ne E0Cft or Not HO,E0Cn Inspected Bobn Ind. RPC Bobbin Ind. INRi 4) NOW HC.

EHOC New Ol1ThsCou n InpcinERso and~ Ne n NWPPCD Vo obbinW. Netbi Ind at EOC,& NOD at at EOCa". Bobbin Bobbin HOC..un 1 ThsClmBn oC.in EOCn NewC forC 1317 Confrme VonaNot RPC RPC Insecte atRepaired EOC~~~~,.j or HtOCOC,or & Not Ind. RPC Ind. Not RPC; Only"Found W. by onalyPlugged LetEpy E at Ind. RPC Detected 0O)5CC Voltage B Crnli tnE nsoceda Eed at HOC, andOC RPC Confire Inspected flRPC LetEpy HC, NOD at Ind. Ind. Bin at HOC.,.

EOC,,~~~~Pluand 1 atInspect at EOC.. 1 at EOCn"Ispcin On Plugge at EOC,,.1 2.1 0 0 0 0 0 0 0 0 0 0 0 0 0 _

2.2 0 0 5 0 0 0 0 0 0 0 0 5 0 1.000 2.3 0 0 3 0 0 0 0 0 0 0 0 3 0 1.000 2.4 0 0 2 0 0 0 0 0 0 0 0 2 0 1.000 2.5 0 0 0 0 0 0 0 0 0 0 0 0 0 2.6 0 0 2 0 0 0 0 0 0 0 0 2 0 1.000 2.7 0 0 0 0 0 0 0 0 0 0 0 0 0 2.8 0 0 3 0 0 0 0 0 0 0 0 3 0 1.000 2.9 0 0 3 0 0 1 0 0 0 0 0 0 3 0 1.000 3.0 0 0 0 0 0 0 0 0 0 0 0 0 0 3.1 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 3.2 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 3.3 0 0 0 0 0 0 0 0 0 0 0 0 0 3.4 0 0 2 0 0 0 0 0 0 0 0 2 0 1.000 3.5 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 3.6 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3.7 0 0 0 0 0 0 0 0 0 0 0 0 0 3.8 0 0 0 0 0 0 0 0 0 0 0 0 0 3.9 0 0 2 0 0 0 0 0 0 0 0 2 0 1.00 4.0 0 0 0 0 0 0 0 0 0 0 0 0 0 8

Enclosure I c PG&E Letter DCL-03-109 Table 1. DCPP Revised LAR POPCD Data (1 6)

Column D E F G H K L M N 0 New EOC., and EOCn., Bobbin EOC., Bobbin Detected __ O ~ d~EOCn".

Detected for POPCD d. Excluded from Nw EOC (Unec or RnPC DD at EOCn) Ind. hr Excluded POPCD Calcuiation")

Analysis' 2 2 EOCn POPCD POPCD Analysis fnOM Bobbin EOC., In. POPCD ____

Ind, RPC ~~~~~~~~~~~~~~~~Found Confirmed EHn OC, New RPC b ofNot BobbIn Bobbin New Now~, New R New Volta E~ Ispced m RPC Id. Ind. INR14' EOC..i BObbin1 This. Column aond EO~ EOC., Now POPCD Bi7 1 Vls Bobbin In.

RCo e atCoCfirme Bobbin hInd.

iNopete at Inspcted at EOC,&

md.,RPC NOD Repaired at t EOC, EOC.,at EOCm or at EOC.,

at EOCnm

& Not RPC Bobbin Ind. RPC CnDfirmed v.

N Bobin Ind. Not nRPeC;e Ind. Found ynW by RPC TintenColunaand ItnialyPlugged Lef Emt E~

at Bobbin Ind. RPC NOD at Bobbin Detected In.

EOC.nj 00SCC Ind.

for Voltage Bin at EO~~om EOCO" ~ and Plugged at isetda at HOC.,.n1 C. at O..

ete Isp~ection EOCus HOC.,

4.1 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 4.2 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 4.3 0 0 0 0 0 0 0 0 0 0 0 0 0 4.4 0 0 2 0 0 0 0 0 0 0 0 2 0 1.000 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 4.6 0 0 0 0 0 0 0 0 0 0 0 0 0 4.7 0 0 0 0 0 0 0 0 0 0 0 0 0 4.8 0 0 0 0 0 0 0 0 0 0 0 0 0 4.9 0 0 0 0 0 0 0 0 0 0 0 0 0 5.0 0 0 0 0 0 0 0 0 0 0 0 0 0 5.1 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 5.2 0 0 0 0 0 0 0 0 0 0 0 0 0 5.3 0 0 1 0 0 0 0 0 0 0 0 1 0 1.0000 5.4 0 0 0 0 0 0 0 0 0 0 0 0 0 5.5 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 5.6 0 0 0 0 0 0 0 0 0 0 0 0 0 5.7 0 0 0 0 0 0 0 0 0 0 0 0 0 5.8 0 0 0 0 0 0 0 0 0 0 0 0 0 5.9 0 0 0 0 0 0 0 0 0 0 0 0 0 6.0 0 0 0 0 0_ 0 0 0 0 0 0 0 0 9

Enclosure 1, PG&E Letter DCL-03-109 Table 1. DCPP Revised LAR POPCD Data (1,6 )

Column B C D F GE H I J K L M N 0 Now EOC, and EOC,, Bobbin EOC,, Bobbin Detected Now EOCi,,, (Undetected or RPC NDD at HOC.) Ind. for EoPOPCD Caculaton Detected for POPCD Ind. Excluded *om POPCD Analysis Exlde OCDClulo Analysiobbins POPCD PoP

.~ ,______ _______ __________ EOCa Id. POPC D Bobbin Found IndL, RPC EOC., 1 ~lb) by 0 0n Confrmed Bobn ENwRP eOCtin HEO on Not Borin. Bobbin NOW frno inspeCon New New COCEC dau ictof e HOCa tslri nt n at o Bobblantspeinic P Boi INRdsrBobbin obin bInd Inspected nd. Ne VO4. BNobbin Ind. at EOC, b& EOCn".

at Bobbin 1 Ind. FouasThis Column and Bobbi indicatOins n forPC a~-ref considered to be or Not Ind Ind.and Oni by Ind. RPC Detected ODSCC Voltage 5.a)n d newinspected at aat eEOCn reoat n RPC f Conrmed fon bPC Lef envoymixe NDOat Ind. Ind. Bin at EOC ns arec EOCn+" Inspectedinsevtion aoCD.I Pue A i icatnat heO C at EO. at hOC Inpcion g tesq EOCn, Total 693 _39 -8 93 54 42178 15 0 18 10 o1901 49 Notes:

1. POPCD for each voltage bin calculated as (EOCr, Bobbin Detected for POPCD Analysis)I(EOCn Bobbin Detected for POPCD Analysis + New EOCn. 1 Ind. for POPCD Analysis).

By column, POPCD = (B+C+D)Ij(B+C+D)+(G+H+I+J+K)].

2. EsCq detection based on inspection records for EOCn. Voltages obtained from EOCt Inspection records.
3. Plant specific POPCD to be based upon voltage bins of 0.10 volt. Industry PQPCD database may use 0.20 volt bins due to difficulty of adjusting existing database to smaller bins.
4. INR = bobbin indication found at EOCn but not reported at EOC+ 1 including resolution analyst review to assign Indication as INR. Bobbin indications found to be RPC NDD or INR are considered to be false calls and not included Inthe POPCD analysis.
5. (a) Includes new indications at EOCn+1, not reported in the bobbin inspection, and found by RPC inspection of dents, mixed residuals or other reasons for the RPC inspection.

These Indications are included as new indications at each EOCnl found only by RPC Inspection even it included as a new indication Inprevious POPCD evaluations. (b)If the RPC inspection identifies more than one ODSCC indication at the same TSP intersection, the bobbin voltage assigned to the TSP Isestimated as the square root of the sum of squares for the bobbin voltages Inferred from the RPC Indications.

6. The sum of all EOCIn bobbin Indications = sum of columns B through F. The sum of all EOC,. 1 bobbin indications = sum of columns B+C+E+G+H+J+L.
7. Indications found to be RPC NDD at EOCn are classified for POPCD as not detected at EOCn. If detected by bobbin at EOCn+1 with confirmation by RPC or no RPC inspection and if detected only by RPC, they are considered as new EOCn+ 1 indications for the POPCD analysis.

10

Enclosure 1, PG&E Letter DCL-03-109 Table 2. DCPP New NRC POPCD Data (1,6)

Column B I C D E F G H I J K L M N 0 Now EOC,, and EOC,, Bobbin EOC,, Bobbin DetectedEOm Detected for POPCD Analys~~~~~s HOC,, ~~ POPCD~~~~~POPCDNowhOCn, (Undetected orAnalysis t Ind.Excluded fom RPC NOD at EOCJ Ind. f 1 Excluded lOCr POPCD Calculaiffonm AnalysisOP0PCD E0Cn ~~~~~~~~~~~~~~~~~~~~from Bobbin .OC,, Ind. POPCD Ind. RPC HO,,, Found EOC,, EOC,, confirme EOC, En Only t 1by Bobbin Inl. Bobbin Ind. N ll Bobbin l EOC, New PC RPC Not RPC ins~o N no.t iobbl. Now,. O,. New RPC Cont, or insetin New Cofre RP NspetedC at petd n. at P Id INWRD Bobbn" EOC.. 1 Not insp. or EnOC..1 EOC,, New POPCD Voltag tECo ,.,e Isece aOCt. Re ~EOC, & NO or aEn Bon Bonbin

.* d. Found Found Only an Bobbin BobbIn EOC,,. for Bln a(Exclue (Exclude Rpaired atEOC..o & Not In. RPC In. o Only')' by by RPC that Plgeda Indl. RPC Detected 003CC Voltage B EHOC,,s (Exclude RC at EOC at EOCn RPC Con d nspect RPC was EOC6 E.C NOD at Indt. Intd. Bin NOD nRPCo NOD nCol. Plgnd atInspected at EOC,,. Inpce Inepection Bobbin EOCnm, NDD InCol. NOD In Col. Plugged at at HEEO... detected but

.1) J) HOC. RPC NOD 0.1 3 1 0 0 0 23 51 0 0 0 6 4 74 0.051 0.2 13 37 2 5 4 100 389 0 25 1 18 52 515 0.092 0.3 49 177 5 25 9 132 516 29 25 0 27 231 702 0.248 0.4 69 265 17 11 14 104 384 88 26 1 20 351 603 0.368 0.5 68 253 8 15 14 65 199 27 10 3 6 329 304 0.520 0.6 77 191 8 14 4 38 113 11 7 10 7 276 179 0.607 0.7 73 140 4 10 5 27 59 1 7 3 8 217 97 0.691 0.8 51 85 7 5 1 19 37 1 5 0 3 143 62 0.698 0.9 57 64 2 2 2 16 14 0 4 0 1 123 34 0.783 1.0 36 38 1 1 1 4 5 0 0 0 1 75 9 0.893 1.1 35 16 6 0 0 6 6 0 0 0 2 57 12 0.826 1.2 17 21 2 3 0 3 3 0 2 0 2 40 8 0.833 1.3 22 18 0 1 0 2 4 0 0 0 0 40 6 0.870 1.4 27 9 2 1 0 2 1 0 0 0 0 38 3 0.927 1.5 13 7 1 0 0 1 0 0 0 0 0 21 1 0.955 1.6 7 4 1 0 0 0 0 0 0 0 0 12 0 1.000 1.7 10 1 0 0 0 0 0 0 0 0 0 11 0 1.000 1.8 8 1 0 0 0 0 0 0 0 0 0 9 0 1.000 1.9 7 0 0 0 0 0 0 0 0 0 0 7 0 1.000 2.0 10 1 0 0 0 0 0 0 0 0 0 11 0 1.000 11

Enclosure I, PG&E Letter DCL-03-109 Table 2. DCPP New NRC POPCD Data (1,6)

Column B C D E F G H I J K L M N 0 New EOCn and WOC,,4 Bobbin EOC. Bobbin Detected EOCr."

Detected for POPCD Ind. Excluded from New EOCn. (Undeteced or RPC NDD at EOCJ Ind. for Excluded POPCD Calculation/)

AnalysIYSi POPCD POPCD Analysis from Bobbin EOC. Ind. POPCD Ind9 RPCE EOC~~~~~~~~~~~~~~.

Fun EOC. EOC, ConEO~

n, P NWEobbn" Ind., RPC Bobbin Ind. Bobbin Ind. Cnimd Bobbin EO NwBbiIn. RP InB l 6NeW RPC Conf. or Inspection Now RPC Confirmed Net RPC Inspectednat n ected sot lInd.ORPC Iat INR Now EOCR,4) Bobbn EO ~rm Net Insp. or and EOC.ni EOCn Now POPCD VBlv ECofre Inpcd at a EOC, CINOat t EOC,~.1 Bobi d. Found Inet Found Only Bobbin Bobbin EOCWH for Volta at EOn" EOCw.1 Repaired EC"or & Net Ind. RC Ind 0o'-nW'by bRPtht Plugged atId. RPC Detected 0D9CC Voltage (Excludes (Excludes at EOC.6 at EOCn RC Cn P RPC was EOC EOn NOD at Ind. Ind. Bin lD lNOD In Cci. N In C R u inspected at EOCF. Inspected inspection Bobbin NOJI)Cl NOD InCo.OC,~d at EOCnm at EOC+ 1 detectedi but J) J) ~~RPC EO~~~~~~~~~~~~~n NOD M 2.1 0 0 0 0 0 0 0 0 0 0 0 0 0 2.2 0 0 5 0 0 0 0 0 0 0 0 5 0 1.000 2.3 0 0 3 0 0 0 0 0 0 0 0 3 0 1.000 2.4 0 0 2 0 0 0 0 0 0 0 0 2 0 1.000 2.5 0 0 0 0 0 0 0 0 0 0 0 0 0 2.6 0 0 2 0 0 0 0 0 0 0 0 2 0 1.000 2.7 0 0 0 0 0 0 0 0 0 0 0 0 0 2.8 0 0 3 0 0 0 0 0 0 0 0 3 0 1.000 2.9 0 0 3 0 0 0 0 0 0 0 0 3 0 1.000 3.0 0 0 0 0 0 0 0 0 0 0 0 0 0 3.1 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 3.2 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 3.3 0 0 0 0 0 0 0 0 0 0 0 6 0 3.4 0 0 2 0 0 0 0 0 0 0 0 2 0 1.000 3.5 0 0 1 0 0 0 0 0 0 0 0 0 1.000 3.6 0 0 0 0 0 0 0 0 0 0 0 0 0 3.7 0 0 0 0 0 0 0 0 0 0 0 0 0 3.8 0 0 0 0 0 0 0 0 0 0 0 0 0 3.9 0 0 2 0 0 0 0 0 0 0 0 2 0 1.000 4.0 0 0 0 0 0 0 0 0 0 0 0 0 0 12

Enclosure I PG&E Letter DCL-03-109 Table 2. DCPP New NRC POPCD Data (1s 6)

Column jj l C l D Ej l F a G H I J K L M N 0 New EOC. and EOC,,.a Bobbin EOCJI Bobbin Defected NowEC. Udtce rRCN tEC)Id o ExC"Iu Detected for POPCD Ind. Excluded from oorPC PCAnatysid Excl POPCD Calculation("

Ana"Isw EM POPCD ~~~~~~~~~~~~~~~~~~~~~~from Bobbin Bobbin EOCn Ind. POPCD

~~~~~~~~~~~~~~~~~Found EOCn EOC, Ind.,RPC EOC, EOC,,j OnIVfb by Bobbin lnd. Bobbin Ind. ConfrmNd Bobbin EOC, NOW. Bobbin lnd., RPC RPC Not RPC onr No Id. RPC Bobbin New EOCatI NeW RPC Coef. or Inpcto NO Confirmed I; Inspectedat a pc NOD at Ind. INR'4 ) HOC.., Bobbi EOCj.1 Not mosp, or and EOCno. EOC, NOW POPCD Voltat lOCC, EO & at EOC,l Bobbin n d.Found Found Only l Bobbin Bobbin E0C.l for E dECz1 E=- l O1 Repaired EOCO or l NotE Ind. lP Ind. Hot by by C thatEPlOufgged atld. RPC Detected ODSCC Voltage Bn (Excludes (Ecludes Reaire EOC, a O,~r &Nt RPCCo ld RPCb RPCwa O6 En NOD at Ind. Ind. Bin EOC,, RPC HOC. RPC and at EOCw"RC nsOCte Cofre inspected Inspection Bobbin EOCn,.

NOD In Col. NOD In Col. anugd ata lns" at OC,,.etctdu EO,.

J) J) EOC,RPNO 4.1 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 4.2 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 4.3 0 0 0 0 0 0 0 0 0 0 0 0 0 4.4 0 0 2 0 0 0 0 0 0 0 0 2 0 1.000 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 4.6 0 0 0 0 0 0 0 0 0 0 0 0 0 4.7 0 0 0 0 0 0 0 0 0 0 0 0 0 4.8 0 0 0 0 0 0 0 0 0 0 0 0 0 4.9 0 0 0 0 0 0 0 0 0 0 0 0 0 5.0 0 0 0 0 0 0 0 0 0 0 0 0 0 5.1 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 5.2 0 0 0 0 0 0 0 0 0 0 0 0 0 5.3 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 5.4 0 0 0 0 0 0 0 0 0 0 0 0 0 _____.

5.5 0 0 1 0 0 0 0 0 0 0 0 1 0 1.000 5.6 0 0 0 0 0 0 0 0 0 0 0 0 0 5.7 0 0 0 0 0 0 0 0 0 0 0 0 0 1.000 5.8 0 0 0 0 0 0 0 0 0 0 0 0 0 5.9 0 0 0 0 0 0 0 0 0 0 0 0 0 6.0 0 5.9~~~ 00 0 0 07 00 7 0 0 -0 0 0 0 0 0 0 13

Enclosure 1.

PG&E Letter DCL-03-109 Table 2. DCPP New NRC POPCD Data (1,6)

Coluimn D E0 H I JK L M N 0 New EOCn and EOCfj Bobbin EOC. Bobbin Detected New EOCw (Undetected or RPC NDD at EOCn) Ind. for EOCPD, Detected for POPCD Ind. Excluded from POC AayssExcluded POPCD Caicuiatflon"1' Anis"ism POPCD POC nlssfrom Bobbin EOCR Ind. POPCD EOC, a OC. Ind., RPC Cd E o FoundlEby Bobbin Ind. Bobbin Ind. ConfrNod Bobbin EOC,, New Bobbin Ind., RPC RPC Not.RPC ,Ns I. RPC _d. in NoC ECno Now RPC Cant. or Inspectio NOW Notriesed atoHOC Inspected at Ited atCECn NOD ator IBobbin at EOC..i Bobbin mdNo EOCn"

d. Found Not Foundmap, or Only Plgeand t EOC,.

Bobbin EOCn Bobbin NeW EOC6.. POPCD for Bint3 A On" E~ " Repaired EO,. r &Not In. RPC In.Nt OnIV3) by by RPC that d. RPC Inu~ Detected ODSCC Voltage (Excludes (Excludes at EOC, at EOCn RPC Cofime I 171 RPC RPC was111810 EOC,, EOCn NOD at Ind. Ind. Bin

~652ab Total EOCn RPC~ ~1 2 ~

EOCaIRPC onire and 4 inspected at 52 Insp,ectdInspe 15 on Bbi O, 09 20 NODIn Col. NOD InCol. Plugged at HOC,,at Et EOC,,. detectebbi Ebut J) J) EOC,, RPC NOD M Total 652 ~1329 98 ( 93 1 54 542 178111571 111 ~ 18 J 101 j2079]1 2609 Notes:--

1. POPCD for each voltage bin calculated as (EOCn Bobbin Detected for POPCD Analysis)y(EOCn Bobbin Detected for POPCD Analysis + New EOCn+i Ind. for POPCD Analysis).

By column, POPCD = (B+C+D)4(B+C+D)+(G+H+I+J+K)].

2. EOCn detection based on Inspection records for EOCn. Voltages obtained from EOCn Inspection records.
3. Plant specific POPCD to be based upon voltage bins of 0.10 volt. Industry POPCD database may use 0.20 volt bins due to difficulty of adjusting existing database to smaller bins.
4. INR = bobbin indication found at EOCn but not reported at EOCn+1 including resolution analyst review to assign Indication as INR. Bobbin Indications found to be RPC NDD or INR are considered to be false calls and not Included in the POPCD analysis.
5. (a) Includes new Indications at EOCni, not reported I the bobbin inspection, and found by RPC inspection of dents, mixed residuals orother reasons for the RPC Inspection.

These IndIcations are included as new Indications at each EOCn+ found only by RPC Inspection even if included as a new Indication in previous POPCD evaluations. (b) If the RPC inspection Identifies more than one ODSCC Indication at the same TSP intersection, the bobbin voltage assigned to the TSP Is estimated as the square root of the sum of squares for the bobbin voltages Inferred from the RPC indications.

6. The sum of all EOCn bobbin indications = sum of columns B through F. The sum of all EOCn+t bobbin Indications = sum of columns B+C+E+G+H+J+L.
7. Indications found to be RPC NDD at EOCn are classified for POPCD as not detected at EOCn. If detected by bobbin at EOCn+1 with confirmation by RPC or no RPC Inspection and if detected only by RPC, they are considered as new EOC,+, indications for the POPCD analysis.

14

Enclosure 1 PG&E Letter DCL-03-109 Table 3 DCPP POPCD Loglogistic Parameters Revised LAR New NRC POPCD LAR POPCD POPCD LogLogistic LogLogistic LogLogistic (from Table 6 of Parameter DCL-03-078)

Number of Data Points 4688 4688 4646 a.0 (intercept) 1.658 1.644 1.7673 a.1 (slope) 4.385 4.659 4.7049 V11 0.00511 0.00522 0.00546 V12 0.00997 0.01043 0.01078 V22 0.02473 0.02654 0.02687 Deviance 5351 5221 5188.56 MSE 0.195 0.1890 0.1895 Binary TRUE TRUE TRUE Chi Sqr 912 885.5 879.82 DoF 4686 4686 4644 p-Value < 2.9E-07 <2.9E-07 < 2.9E-07 Table 4 Diablo Canyon Unit 2 End of Cycle 12 Monte Carlo Results With Voltage Dependent Growth Steam 95 Percent Upper Confidence Limit Steam Line Break Generator Probability of Burst Leak Rate (gpm)

( Jor More Fallures)

Revised LAR New NRC LAR POPCD Revised LAR New NRC LAR POPCD POPCD POPCD POPCD POPCD SG 2-1 9.02E-04 9.69E-04 9.60E-04 0.72 0.75 0.72 SG 2-2 9.13E-04 9.90E-04 7.54E-04 0.61 0.62 0.60 SG 2-3 7.48E-04 7.OOE-04 6.69E-04 0.49 0.50 0.48 SG 2-4 6.46E-03 6.01 E-03 5.52E-03 2.89 2.93 2.81 15

A.

Enclosure 1.,

PG&E Letter DCL-03-109 Table 5a. POPCD Matrix for Indications <=1.00v at EOC. (NRC Requested Format)

POPCD Matrix for Indications <=1.00v at EOCN BDD at EOC+ 1 j BND at EOCn+ 1 __

EOCn BDD wo RPC BDD w/RDD BDD wlRND BND w/o RPC BND w/RDD BND wIRND Not Not I Not Not Not Not Plugged Plugged Plugged P PluggedjPlugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged 11 _ ._:,__ _ .;

BDD w/o RPC Not Plugged 40 968 132 158 0 33 0 24 0 0 0 0 at BDD w/ RDD Plugged 43  :; ..  :

EOC~ ________ Not Plugged _ 1 242 17 185 0 1 0 0 0 4 0 1 n

BDD wi RND Plugged 2 . ...

Not Plugged 3 66 7 33 0 48 0 30 0 0 0 3 Plugged =_=_.._ _ , _ _ _ _.:___ _ ___;__

BND w/o RPC Not Plugged _ 43 1721 89 420 4 88 No Count No Count 24 91 No Count No Couni BND BNDw/RDD Plugged 18 = -7_ __=__=

Not Plugged 0 2 00 11 0 No Count No Count 3 21 No Count No Couni

~

Evb BND w/RND Plugged = = .,.__ _

=

,." PIFM --

= _ _ __

- -7~

BND_____N . Not Plugged 0 1 3 5 0 5 No Count No Count 11 7 No Count No Counl 16

Enclosure 1, PG&E Letter DCL-03-109 Table 5b. POPCD Matrix for Indications >1.00v and <=2.00v at EOCn (NRC Requested Format)

POPCD Matrix for Indications >1.00v and c=2.00v at EOCn BDD at EOCv1._ BND at EOC,+,

EOCn BDD w/o RPC BDD w/RDD BDD wlRND BND wlo RPC BND w/RDD BND w/RND Not Not Not Not Not Not

-, ___PhggedPlugged Plugged Plugged PluggedPlugged Plugged Plugged Plugged Plugged Plugged Plugged 9  :  : _ . . . .  : : .

BDD w/o RPC Not Plugged _ 0 52 130 4 0 2 0 0 0 0 0 0 at BDD wi RDD Plugged 3 ____._ ___. . _____.

EOCn BDD w/ RND Not Plugged 1 1 25 15 7 0 0 0 0 0 0 0 0 BDD w I RND Pl g e I__ ___ _ __ ___ _ __ _ _

Not Plugged 0 1 0 1 0 2 0 0 0 0 0 0 Plugged _7777 BND w/o RPC Not Plugged 0 14 3 11 1 3 No Count No Count 0 0 No Count No Count atB BND wN RDD EOCI, Plugged NotPlugged ___

__~~ 0r 0

__=_=_=_u_._ 0po WIM 0 0 0 _

EOC _____ Not Plugged 0 0 0 0 0 0 No Count No Count 0 0 No Count No Count BND w/ RND Plugged  : .- y f  :

BNDwlND Not Plugged :J O O O O O O Nlo Count No Count O O No Count No Count 17

Enclosure 1, PG&E Letter DCL-03-109 Table 5c. POPCD Matrix for Indications >2.00v at EOCn (NRC Requested Format)

POPCD Matrix for Indications >2.00v at EOCn BDD at EOC _ __ _ BND at EOCn. 1 EOCn BDD w/o RPC BDD w/RDD BDD w/RND BND w/o RPC BND w/RDD BND w/RND l Not Not Not lNot Not Not

_______ _Pluggeded Pluggd Plugged Plugged Plugged Plugged P Plugged Plugged Plugged Plugged 0 . , . ;.:

BDD w/o RPC Not Plugged = 0 0 0 0 0 0 0 0 0 0 0 0 BDD - .. .. -

at BDD w/ RDD Plugged 32 ___,-_ J_._______ __,, . _,._._ ______ _.,,

EOCN ________ Not Plugged _ 0 0 0 0 0 0 0 0 0 0 0 0 BDD w/ RND Plugged 0 -_=__  ;-

=

Not Plugged 0 0 0 0 0 0 0 0 0 0 0 0 Plugged __7- = .-

BND w/o RPC Not Plugged °0 0 0 0 0 0 No Count No Count 0 0 No Count No Count BND 77 7 at BND w/ RDD Plugged 0 _  ! _____ ;__,. _

EOCn EQC ________ Not Plugged 0 0 0 0 0 0 No Count No Count 0 0 No Count No Count BND w/RND Plugged _. _ '=_______. _ _ __ _ _ _

, Not Plugged 0 0 0 0 0 0 No Count No Count 0 0 No Count No Count 18

Enclosure t PG&E Letter DCL-03-109 Table 5d. POPCD Matrix for All Indications (NRC Requested Format)

POPCD Matrix for All Indications BDD at EOCn, 1 _BND at EOCn,1 EOCn BDD wlo RPC BDD w/RDD BDD w/RND BND w/o RPC BND w/RDD BND w/RND Not Not Not Not Not Not Plugged Plugged Plugged Plugg Plugged Plu Plugged Pi Plugged Plugged Plugged Plugged 20  : :  :  :: _  ::

BDD w/o RPC Not Plugged _ 40 1020 262 162 0 35 0 24 0 0 0 0 at BDD w/ RDD Plugged 78 _____ _ _ ____- ___.__ _

EOCn NotPlugged 2 267 32 192 0 1 0 0 0 4 0 1 BDD w/ RND Plugged 3 . .  :.. . _

Not Plugged 3 67 7 34 0 S0 0 30 0 0 0 3 Plugged =__ __ __ _.____._ _______ .

BND w/o RPC Not Plugged _ 43 1735 92 431 5 91 No Count No Count 24 91 No Count No Count BND7177 777"= 7 at BND w/ RDD Plugged  : 18 _ =____; _ _ _ ______

EOCn Not Plugged 0 2 0 11 0 0 No Count No Count 3 21 No Count No Count BND w/ RND Plugged = _= __ _ _________-__

.__________ Not Plugged _ 0 1 3 5 0 5 No Count No Count 11 7 No Count No Count BDD = Bobbin detected Indication BND = Bobbin no detectable degradation intersection RDD = RPC detected Indication RND = RPC no detectable degradation intersection No Count = Intersections having no bobbin or RPC indication at either EOCn or EOC.+ 1 .

19

Enclosure 1 PG&E Letter DCL-03-109 Figure 1 DCPP Revised LAR POPCD Distribution - Nominal & Lower 90% Confidence Level GLM Loglogistic Fit Weighted by Number of Indications Per Voltage Bin - Revised LAR POPCD Data (8/l/03) 1.0 C) -

--.- Nominal Regression Fit

  • - -Lower 90% Confidence 0.9 - POPCD Fractional Detection Values 0.8 6070.7 0 0.6-0.5-0.4 -

, 0.3 _-= =

I.'2 i'_________

0.2 0.1 0.0 - _-

0.1 1.0 10.0 Bobbin Coil Volts 20

Enclosure I PG&E Letter DCL-03-109 Figure 2 Comparison of DCPP Revised LAR and LAR POPCD Distributions GLM Loglogistic Fit Weighted by No. of Indications Per Voltage Bin - Revised LAR POPCD Data (8/1/03) 1.0 'II - -I ..-

1.0- DCPP LAR POPCD 0.9 - ** DCPP Revised LAR POPCD os I ___

! I I A4=t~~~~Tt

____7____

0.6 0.5-04.4-03 0 2-

~

I.4 ~ ~ A 0.1 _- - - ___

0.1 1.0 10.0 Bobbin Coil Volts 21

Enclosure 1 PG&E Letter DCL-03-109 Figure 3 Comparison of DCPP Revised LAR and New NRC POPCD Distributions GLM Loglogistic Fit Weighted by No. of Indications Per Voltage Bin - Revised LAR POPCD Data (8/1/03) 1.0 I W-

.0 DCPP New NRC POPCD __ - ____

0.9 _ - DCPP Revised LAR POPCD _ _ _ _

0.8 -

L)0.7 0

00.6 0.2 0.0 0.0.4 0.2 0.1 0.0 0.1 1.0 10.0 Bobbin Coil Volts 22

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